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01 Jul 2017, 00:40
Kudos
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
66% (02:28) correct
34%
(02:33)
wrong
based on 231
sessions
History
Date
Time
Result
Not Attempted Yet
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
(A) 280
(B) 290
(C) 300
(D) 310
(E) 320
Luckisnoexcuse
Current Student
Joined: 18 Aug 2016
Last visit: 16 Apr 2022
Posts: 529
Given Kudos: 198
Concentration: Strategy, Technology
Schools: Kenan-Flagler '20 (M)
GMAT 1: 630 Q47 V29
GMAT 2: 740 Q51 V38
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01 Jul 2017, 00:59
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Bookmarks
Bunuel
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
(A) 280
(B) 290
(C) 300
(D) 310
(E) 320
Distance traveled = 800
T = (400/350) + (400/250) = (8/7) + (8/5) = 96/35 Hrs
Speed = (800/96)*35 = 3500/12 = ~291
Hence B
01 Jul 2017, 02:31
Kudos
Bookmarks
total time taken=400/350+400/250=96/35
total distance traveled = 400+400=800
average speed=800*35/96=291.66
hence B
total distance traveled = 400+400=800
average speed=800*35/96=291.66
hence B
