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A car travel 140 miles in 4 hours, while

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Carcass
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A car travel 140 miles in 4 hours, while [#permalink] New post   16 Apr 2021, 07:08
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A car travels 140 miles in 4 hours, while the return trip takes 3 1/2 hours. What is the average speed in miles per hour for the entire trip?

A. 35

B. 371/3

C. 371/2

D. 40

E. 75


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Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
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A car travel 140 miles in 4 hours, while [#permalink] New post   18 Apr 2021, 07:28
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Carcass wrote:
A car travels 140 miles in 4 hours, while the return trip takes 3 1/2 hours. What is the average speed in miles per hour for the entire trip?

A. 35

B. 371/3

C. 371/2

D. 40

E. 75


Average speed \(= \frac{(140+140)}{(4 + 3.5)} = 37.33m/h\)

Hence, option B
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Re: A car travel 140 miles in 4 hours, while [#permalink] New post   12 Nov 2021, 10:30
Carcass wrote:
A car travels 140 miles in 4 hours, while the return trip takes 3 1/2 hours. What is the average speed in miles per hour for the entire trip?

A. 35

B. 371/3

C. 371/2

D. 40

E. 75


Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book

Average speed = (total travel distance)/(total travel time)

\(= \frac{140 miles + 140 miles }{4 hours + 3.5 hours}\)

\(= \frac{280}{7.5}\)

\(= \frac{560}{15}\) I multiplied numerator and denominator by 2 to get an easier fraction to work with

\(= 37\frac{5}{15}\)

\(= 37\frac{1}{3}\) miles per hour

Answer: B
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Re: A car travel 140 miles in 4 hours, while [#permalink]
12 Nov 2021, 10:30
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