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A car traveled at 80 mph for the first half (by time) of a t
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30 Apr 2019, 01:17
30 Apr 2019, 01:17
Expert Reply
00:00
Question Stats:
75% (00:54) correct
25% (01:22) wrong based on 12 sessions
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A car traveled at 80 mph for the first half (by time) of a trip and at 40 mph for the second half of the trip. What is the average speed of the car during the entire trip?
(A) 20
(B) 40
(C) 50
(D) 60
(E) 80
(A) 20
(B) 40
(C) 50
(D) 60
(E) 80
Re: A car traveled at 80 mph for the first half (by time) of a t
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16 Apr 2020, 09:00
16 Apr 2020, 09:00
Expert Reply
total time = x
so 1st half distance = 80*x/2 ; 40x
and 2nd half distance= 40*x/2 ; 20 x
so total distnace = 60 x
and total speed = 60x/x ; 60
D is the answer
so 1st half distance = 80*x/2 ; 40x
and 2nd half distance= 40*x/2 ; 20 x
so total distnace = 60 x
and total speed = 60x/x ; 60
D is the answer
gmatclubot
Re: A car traveled at 80 mph for the first half (by time) of a t [#permalink]
16 Apr 2020, 09:00
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