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A motorist travels 90 miles at rate of 20 miles per hour. If he return

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Math Expert
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V
Joined: 02 Sep 2009
Posts: 55638
A motorist travels 90 miles at rate of 20 miles per hour. If he return  [#permalink]

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New post 07 Jan 2019, 04:22
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

79% (01:43) correct 21% (01:53) wrong based on 61 sessions

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CEO
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P
Joined: 18 Aug 2017
Posts: 3866
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
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Re: A motorist travels 90 miles at rate of 20 miles per hour. If he return  [#permalink]

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New post 07 Jan 2019, 04:30
1
Bunuel wrote:
A motorist travels 90 miles at rate of 20 miles per hour. If he returns the same distance at a rate of 40 miles per hour, what is the average speed for the entire trip, in miles per hour?

A. 20
B. 65/3
C. 80/3
D. 30
E. 130/3



same distance is covered at different speed , avg speed= 2ab/a+b
= 2*20*40/60
= 80/3
IMO C
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Joined: 04 Oct 2017
Posts: 81
Re: A motorist travels 90 miles at rate of 20 miles per hour. If he return  [#permalink]

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New post 07 Jan 2019, 04:33
Bunuel wrote:
A motorist travels 90 miles at rate of 20 miles per hour. If he returns the same distance at a rate of 40 miles per hour, what is the average speed for the entire trip, in miles per hour?

A. 20
B. 65/3
C. 80/3
D. 30
E. 130/3



IMO

Total distance travelled = 180miles
Total time 6.75 Hrs
Average speed = Total distance travelled/ total time = 80/3
Option C
GMAT Club Bot
Re: A motorist travels 90 miles at rate of 20 miles per hour. If he return   [#permalink] 07 Jan 2019, 04:33
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A motorist travels 90 miles at rate of 20 miles per hour. If he return

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