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Cars A and B travel the same 140-mile route. If car A takes 3 hours

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Cars A and B travel the same 140-mile route. If car A takes 3 hours [#permalink] New post   04 Sep 2019, 06:09
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Cars A and B travel the same 140-mile route. If car A takes 3 hours and 30 minutes to complete the drive, and if car B travels 30 miles per hour faster than car A, how long did it take car B to travel the route?

A. 1 hour and 30 minutes

B. 2 hours

C. 2 hours and 30 minutes

D. 3 hours

E. 3 hours and 30 minutes

Source: McGraw-Hill's GMAT
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B
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Re: Cars A and B travel the same 140-mile route. If car A takes 3 hours [#permalink] New post   04 Sep 2019, 07:40
Distance = Speed x Time
Car A:
Distance = 140 miles
Time: 3 1/2 hours or 7/2 hours
Speed = 140/7/2 = 40 miles / hr
Car B = Speed of Car A + 30 miles / hr = 70 miles / hr
Therefore, Time = Distance/Speed = 140/70 = 2 hours
Choice B

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Re: Cars A and B travel the same 140-mile route. If car A takes 3 hours [#permalink] New post   04 Sep 2019, 07:59
SajjadAhmad wrote:
Cars A and B travel the same 140-mile route. If car A takes 3 hours and 30 minutes to complete the drive, and if car B travels 30 miles per hour faster than car A, how long did it take car B to travel the route?

A. 1 hour and 30 minutes

B. 2 hours

C. 2 hours and 30 minutes

D. 3 hours

E. 3 hours and 30 minutes

Source: McGraw-Hill's GMAT


Speed of Car A is 140/(7/2) = 40
Speed of Car B is = 70

So, Time required to travel the route will be 140/70 = 2 Hours., Answer must be (B)
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Re: Cars A and B travel the same 140-mile route. If car A takes 3 hours [#permalink] New post   04 Sep 2019, 08:18
Speed of A is 140/3.5 = 40
Speed of B is = 40+30 = 70

B travels the same route for 140/70 = 2 hours.

Answer is (B)

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Re: Cars A and B travel the same 140-mile route. If car A takes 3 hours [#permalink] New post   09 Sep 2019, 10:57
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SajjadAhmad wrote:
Cars A and B travel the same 140-mile route. If car A takes 3 hours and 30 minutes to complete the drive, and if car B travels 30 miles per hour faster than car A, how long did it take car B to travel the route?

A. 1 hour and 30 minutes

B. 2 hours

C. 2 hours and 30 minutes

D. 3 hours

E. 3 hours and 30 minutes

Source: McGraw-Hill's GMAT


The rate of Car A is 140/3.5 = 40 mph, so the rate of car B is 70 mph. Thus, it took car B, 140/70 = 2 hours to travel the route.

Answer: B
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Re: Cars A and B travel the same 140-mile route. If car A takes 3 hours [#permalink]
09 Sep 2019, 10:57
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