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 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
Live EA class + 6 months of EA OnDemand
  • Expert-led weekly online sessions
  • EA Masterclass access between classes
View EA class & enroll
Limited cohort · enrollment openTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

130-point 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 problem

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Newbie | Next Rank: 10 Posts
Posts: 4
Joined: Fri Mar 26, 2010 9:45 pm
by mija » Fri Apr 02, 2010 9:41 am
a boat takes 5 hours to go 300km downstream. It takes the same time to go 150km uppstream. What is
speed of boat in still water and speed of stream ?

Ans :45km/hr,15 km/hr

please explain the 2 equations formed here ?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
User avatar
MBA Student
Posts: 403
Joined: Tue Dec 22, 2009 7:32 pmFollowed by: 22 members
Thanked: 98 times

by fibbonnaci » Fri Apr 02, 2010 9:52 am
the speed is a mix of both the speed of the boat and the stream

now when a boat travels downstream, the speed of the boat is influenced by the speed of the stream such that the sppeds add up.

so, Distance/time = speed

x-> speed of the stream and y-> speed of the boat.

Downstream,
300/5 = x+y
so, x +y = 60 -> 1

Upstream,
150/5 = x-y [note: when a boat travels against the stream, its speed decreases]

so x-y = 30 ->2

solving these simultaneous equations we get x= 45km/hr and y=15km/hr.

Hope this helps!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Newbie | Next Rank: 10 Posts
Posts: 1
Joined: Fri Feb 05, 2010 3:20 pm

by mbsachi » Fri Apr 02, 2010 9:55 am
Let A be the speed of the boat alone (without considering stream effect)
And B, the speed of stream alone.

Speed = Distance/Time

Downstream:
A + B = 300/5 = 60 km/h
Upstream:
A - B = 150/5 = 30 km/h

Solving these 2 equations:
A = 45 km/h
B = 15 km/h

Speed of boat in still water = A = 45 km/h
Speed of stream alone = B = 15 km/h
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 54
Joined: Wed Mar 10, 2010 6:11 am
Thanked: 1 times

by suryapal » Fri Apr 02, 2010 9:55 am
speed *time = distance

(B+S)*5= 300 ( where B is the speed of boat and S is the speed of stream)
and
(B-S)*5 = 150

on solving both equation we get the requires answer.. i.e B = 45 and S=15
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1