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A girl rode her bicycle from home to school, a distance of 1

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GeminiHeat
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A girl rode her bicycle from home to school, a distance of 1 [#permalink] New post   01 Jan 2020, 04:06
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A girl rode her bicycle from home to school, a distance of 15 miles, at an average speed of 15 miles per hour. She returned home from school by walking at an average speed of 5 miles per hour. What was her average speed for the round trip if she took the same route in both directions?

(A) 7.5 miles per hour
(B) 10 miles per hour
(C) 12.5 miles per hour
(D) 13 miles per hour
(E) 25 miles per hour
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A
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Re: A girl rode her bicycle from home to school, a distance of 1 [#permalink] New post   02 Jan 2020, 09:03
Average Speed = Total Distance traveled/ Total time taken.
Total Distance = 15miles + 15miles (going and coming back) = 30 miles
Time taken while going = Distance / Speed = 15miles / 15miles/hours = 1hour
Time taken while coming back = Distance / Speed = 15miles / 5miles/hour = 3hrs
Total time = 1hr + 3hr = 4hrs
Average Speed = Total Distance/ Total time = 30miles / 4hrs = 7.5 Miles/hour
So, Answer will be A
Hope it helps!

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Re: A girl rode her bicycle from home to school, a distance of 1 [#permalink] New post   28 Oct 2022, 06:26
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Re: A girl rode her bicycle from home to school, a distance of 1 [#permalink]
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