Car A started driving north from point X traveling at a

Expert replies

Previous Topic Next Topic

BTGmoderatorLU: Moderator; Posts: 2607; Joined: Sun Oct 15, 2017 1:50 pmFollowed by: 6 members

by BTGmoderatorLU » Sat Sep 29, 2018 1:31 pm

Timer

00:00

Answers

Stats

Difficulty—

Source: Manhattan Prep

Car A started driving north from point X traveling at a constant rate of 40 miles per hour. One hour later, car B started driving north from point X at a constant rate of 30 miles per hour. Neither car changed direction of travel. If each car started with 8 gallons of fuel, which is consumed at a rate of 30 miles per gallon, how many miles apart were the two cars when car A ran out of fuel?

A. 30
B. 60
C. 90
D. 120
E. 150

The OA is C.

Like this post

Source: Beat The GMAT — Problem Solving | Sat Sep 29, 2018 1:31 pm

nav_jm: Newbie | Next Rank: 10 Posts; Posts: 1; Joined: Tue Apr 07, 2015 7:23 am

by nav_jm » Mon Oct 01, 2018 2:50 am

Given, total of 8 gallons fuel with 30 miles per gallon, total distance that can be covered is 8*30 = 240 miles.

Now, Car A travels with a rate of 40 miles per hr, so total time taken to cover 240 miles --> 240/40 = 6 hrs
Now to find total distance covered by Car B travelling at a rate of 30 miles per hr for the same time period(6 hrs as deduced from above) --> 30*6, however
since Car B started 1 hr after Car A, time period would be 6 - 1 = 5 hrs. Now, distance covered by Car B --> 30*5 = 150 miles

Hence Car B was 240 - 150 = 90 miles behind Car A when Car A ran out of fuel. $$$$

Like this post

GMAT/MBA Expert

Scott@TargetTestPrep: GMAT Instructor; Posts: 8207; Joined: Sat Apr 25, 2015 10:56 amFollowed by: 29 members; Location: Los Angeles, CA; Thanked: 43 times

by Scott@TargetTestPrep » Sun Apr 07, 2019 5:30 pm

BTGmoderatorLU wrote:Source: Manhattan Prep

Car A started driving north from point X traveling at a constant rate of 40 miles per hour. One hour later, car B started driving north from point X at a constant rate of 30 miles per hour. Neither car changed direction of travel. If each car started with 8 gallons of fuel, which is consumed at a rate of 30 miles per gallon, how many miles apart were the two cars when car A ran out of fuel?

A. 30
B. 60
C. 90
D. 120
E. 150

The OA is C.

Car A can go 240 miles before running out of fuel. So car A traveled for 6 hours. Since car B started an hour later, car B traveled a distance of 30 x 5 = 150 miles, so the two cars were 240 - 150 = 90 miles apart when car A ran out of fuel.

Answer: C

Scott Woodbury-Stewart
Founder and CEO
[email protected]

See why Target Test Prep is rated 5 out of 5 stars on BEAT the GMAT. Read our reviews

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

563 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (563 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review