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GRE prep Club test questionID: Q01-86

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GRE prep Club test questionID: Q01-86 [#permalink] New post 28 Jul 2017, 09:29
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It takes Joey the postman 1 hours to run a 3 mile long route every day. He delivers packages and then returns to the post office along the same path. If the average speed of the round trip is 5 mile/hour, what is the speed with which Joey returns?

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The answer is in minutes..while the question asks for speed..Please clarify..because if its is speed that is being asked the answer should probably me 15 and if time is being asked the answer is 12
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Re: GRE prep Club test questionID: Q01-86 [#permalink] New post 29 Jul 2017, 02:35
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saumya17lc wrote:
It takes Joey the postman 1 hours to run a 3 mile long route every day. He delivers packages and then returns to the post office along the same path. If the average speed of the round trip is 5 mile/hour, what is the speed with which Joey returns?

11
12
13
14
15

The answer is in minutes..while the question asks for speed..Please clarify..because if its is speed that is being asked the answer should probably me 15 and if time is being asked the answer is 12



The answer has to be 15 mile and not 12 mile-

Av speed= 5 mile

S1 speed for 1st half of the journey

S2 speed for return voyage

therefore Av speed = 2*S1*S2/(S1+S2)

ie 5= 2*3*S2/3+S2.

Solving for S2 = 15 mile
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Re: GRE prep Club test questionID: Q01-86   [#permalink] 29 Jul 2017, 02:35
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GRE prep Club test questionID: Q01-86

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