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# A certain pilot flew 400 miles to City K at an average speed

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Manager
Joined: 03 Oct 2008
Posts: 60
A certain pilot flew 400 miles to City K at an average speed  [#permalink]

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09 Oct 2008, 05:20
1
A certain pilot flew 400 miles to City K at an average speed of 350 miles per hour with the wind and made the trip back at an average speed of 250 miles per hour against the wind. Which of the following is closest to the pilot’s average speed, in miles per hour, for the round-trip?

A. 280
B. 290
C. 300
D. 310
E. 320

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Manager
Joined: 22 Sep 2008
Posts: 115

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09 Oct 2008, 05:43
1
350 , 250 means wind speed is 50 ,

so pilot normal speed will be 300.

1: 400/350 = 1.142 hrs
2: 400/ 250 = 1.6hrs

Total hrs : 2.742
Total distance: 800

Avg speed: 800/2.742 = 291.xxx

else you can use this formula too.

2xy/x+y = 2*350*250/250+300 = 291.xxx

Thanks

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Non-Human User
Joined: 09 Sep 2013
Posts: 10947
Re: A certain pilot flew 400 miles to City K at an average speed  [#permalink]

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10 Apr 2019, 04:01
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Re: A certain pilot flew 400 miles to City K at an average speed   [#permalink] 10 Apr 2019, 04:01
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