BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

★★★★★5.0559 reviews
GMATLiveTeach Starts Oct 17
Chris Peckover, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Chris Peckover, 100th-Percentile GMAT Scorer

Oct 17 · Chris Peckover
Sat · 11:00 AM to 2:00 PM ET
Oct 20 · Chris Peckover
Tue, Thu · 8:00 to 10:00 PM ET
Oct 25 · Josh Braslow
Sun · 1:00 to 4:00 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemand 5 seats left Start anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

Speed , train length

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
User avatar
GMAT Instructor
Posts: 1052
Joined: Fri May 21, 2010 1:30 amFollowed by: 98 members
Thanked: 335 times

by Patrick_GMATFix » Mon Jun 21, 2010 1:45 pm
Hi Francois,

When the train overtakes the bike, the head of the train is x meters from the head of the bike, where x is the length of the train. So the question is, 'what is x?'. We know that the train is 36km/h faster , so every 3600 seconds (each hour), the head of the train gains an advantage 36,000 meters (36 km).

We know that the train takes 40 seconds to overtake the bike. The value of x (the length of the train = distance that the head of the train must gain over the head of the bike for the train to overtake the bike) is equal to the advantage that is accrued in 40 seconds. Set up a proportion:

36,000meters / 3,600seconds = x meters/ 40seconds. Solve to find that x = 400 meters

-Patrick

*Edit: fixed difference between speed is 36km/hr, not 60km/hr
Last edited by Patrick_GMATFix on Mon Jun 21, 2010 1:52 pm, edited 2 times in total.
  • Ask me about tutoring.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 124
Joined: Sun Mar 07, 2010 3:15 pm
Thanked: 1 times

by francoisph » Mon Jun 21, 2010 1:47 pm
OA is 400 meters mate!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
GMAT Instructor
Posts: 1052
Joined: Fri May 21, 2010 1:30 amFollowed by: 98 members
Thanked: 335 times

by Patrick_GMATFix » Mon Jun 21, 2010 1:50 pm
Thanks Francois. I'll fix my answer.

The mistake I made is:
We know that the train is 60km/h faster
. I misread the original question and took 40km/hr as the speed of the bike. The bike actually goes at 64km/hr, so the difference in speed is actually 36km/h, not 60. Careless mistake
  • Ask me about tutoring.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 294
Joined: Wed May 05, 2010 4:01 am
Location: india
Thanked: 57 times

by amising6 » Mon Jun 21, 2010 7:08 pm
francoisph wrote:A train traveling at 100 kmph overtakes a motorbike traveling at 64 kmph in 40 seconds. What is the length of the train in meters?

I really didnt get this one!
now train travelling at 100 kmph will overtake motorbike travelling 64 kmph so assuming they are travelling in same direction
relative speed 100-64=36kmph i.e 36*5/18=10 m/sec (now since train is trying to overtake motorbike so its travelling extra distance at the rate of 10 m/sec)
now overtake has been done in 40 sec so extra distance travelled by train will be equal to the length of train 1.e 40*10=400 m
Ideation without execution is delusion
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
GMAT Instructor
Posts: 1302
Joined: Mon Oct 19, 2009 2:13 pmFollowed by: 164 members
Location: Toronto
Thanked: 539 times
GMAT Score:800

by Testluv » Mon Jun 21, 2010 7:17 pm
Here's a good takeaway for 2 moving-object problems:

--if the objects travel in the same direction, subtract the rates
--if the objects travel in opposite directions (meeting or separating), add the rates.
Kaplan Teacher in Toronto
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 124
Joined: Sun Mar 07, 2010 3:15 pm
Thanked: 1 times

by francoisph » Tue Jun 22, 2010 5:27 am
thks guys

yeah it is relative speed concept here

relative speed 100- 64= 36
36*40 sec *5/18 = 400m
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 748
Joined: Sun Jan 31, 2010 7:54 amFollowed by: 3 members
Thanked: 46 times

by outreach » Tue Jun 22, 2010 10:01 am
trains are travelling in same direction hence the relative speed will be 100-64=36 km/h

1km/h=5/18 m/s
36km/h=x

x=10m/s

when calculating sped of train we can ignore the lenght of bike

length of train=time*speed=40*10=400m/s
-------------------------------------
--------------------------------------
General blog
https://amarnaik.wordpress.com
MBA blog
https://amarrnaik.blocked/
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1