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# A man driving a car at a speed of 50 miles/hour on a road parallel to

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GMAT Forum Moderator
Joined: 28 May 2014
Posts: 480
GMAT 1: 730 Q49 V41
A man driving a car at a speed of 50 miles/hour on a road parallel to [#permalink]

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18 Oct 2017, 10:44
00:00

Difficulty:

35% (medium)

Question Stats:

69% (01:28) correct 31% (01:21) wrong based on 52 sessions

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A man driving a car at a speed of 50 miles/hour on a road parallel to a railway track noticed a train coming from opposite direction. It took 4 seconds for the car to pass the train. If the length of the train was 0.1 miles and the length of the car was negligible, what was the speed of the train?

(a) 40
(b) 60
(c) 70
(d) 80
(e) 90
[Reveal] Spoiler: OA

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Joined: 25 Feb 2013
Posts: 1006
Location: India
GPA: 3.82
A man driving a car at a speed of 50 miles/hour on a road parallel to [#permalink]

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18 Oct 2017, 10:48
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saswata4s wrote:
A man driving a car at a speed of 50 miles/hour on a road parallel to a railway track noticed a train coming from opposite direction. It took 4 seconds for the car to pass the train. If the length of the train was 0.1 miles and the length of the car was negligible, what was the speed of the train?

(a) 40
(b) 60
(c) 70
(d) 80
(e) 90

Let speed of the train be $$x$$. So relative speed $$= 50+x$$

so distance traveled, $$(50+x)*\frac{4}{3600}=0.1$$ (speed * time = distance)

or $$x=40$$

Option A
A man driving a car at a speed of 50 miles/hour on a road parallel to   [#permalink] 18 Oct 2017, 10:48
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