Car A started driving north from point X traveling at a

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BTGmoderatorLU: Moderator; Posts: 2575; Joined: Sun Oct 15, 2017 1:50 pmFollowed by: 6 members

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

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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.

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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. $$$$

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Scott@TargetTestPrep: GMAT Instructor; Posts: 8178; 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

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