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Luke drives the first 300 miles of a trip at 60 miles an hour.

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by BTGModeratorVI » Wed Feb 26, 2020 4:17 pm

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Luke drives the first 300 miles of a trip at 60 miles an hour. How fast does he have to drive, in miles per hour, on the final 200 miles of the trip if the total time of the trip is to equal 7 hours?

A. 60 mph
B. 90 mph
C. 100 mph
D. 120 mph
E. 200 mph

Answer: C
Source: Magoosh
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Re: Luke drives the first 300 miles of a trip at 60 miles an hour.

by Brent@GMATPrepNow » Wed Feb 26, 2020 5:25 pm
BTGModeratorVI wrote: ↑
Wed Feb 26, 2020 4:17 pm
 Luke drives the first 300 miles of a trip at 60 miles an hour. How fast does he have to drive, in miles per hour, on the final 200 miles of the trip if the total time of the trip is to equal 7 hours?

A. 60 mph
B. 90 mph
C. 100 mph
D. 120 mph
E. 200 mph

Answer: C
Source: Magoosh
Luke drives the first 300 miles of a trip at 60 miles an hour.
Time = distance/time
So, travel time = 300/60 = 5 hours

How fast does he have to drive, in miles per hour, on the final 200 miles of the trip if the total time of the trip is to equal 7 hours?
Luke has already spent 5 hours driving the first 300 miles.
In order to complete the trip in a TOTAL of 7 hours, Luke must complete the next 200 miles in 2 hours

Speed = distance/ time
So the speed needed for the second leg = 200/2 = 100 mph

Answer: C

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Brent
Brent Hanneson - Creator of GMATPrepNow.com
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Re: Luke drives the first 300 miles of a trip at 60 miles an hour.

by Scott@TargetTestPrep » Sat Mar 07, 2020 6:50 am
BTGModeratorVI wrote: ↑
Wed Feb 26, 2020 4:17 pm
 Luke drives the first 300 miles of a trip at 60 miles an hour. How fast does he have to drive, in miles per hour, on the final 200 miles of the trip if the total time of the trip is to equal 7 hours?

A. 60 mph
B. 90 mph
C. 100 mph
D. 120 mph
E. 200 mph

Answer: C
Source: Magoosh
The time for the first part of the trip is 300/60 = 5 hours. Thus, he has 7 - 5 = 2 hours to drive 200 miles. In order to achieve this, he has to drive at 200/2 = 100 mph.

Answer: C

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