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Two trains of equal length are running on parallel lines in the same

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Two trains of equal length are running on parallel lines in the same  [#permalink]

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New post 24 Nov 2019, 10:48
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Question Stats:

45% (02:03) correct 55% (03:06) wrong based on 22 sessions

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Two trains of equal length are running on parallel lines in the same direction at 46 kmph and 36 kmph. The faster train passes the slower train in 36 seconds. The length of each train is:
(a) 82 metre
(b) 50 metre
(c) 80 metre
(d) 72 metre
(e) 90 metre

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Re: Two trains of equal length are running on parallel lines in the same  [#permalink]

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New post 24 Nov 2019, 11:26
Actually I think the answer would be 100 ms but there is no such an option among the options.
Can some one correct my answer?

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Two trains of equal length are running on parallel lines in the same  [#permalink]

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New post 24 Nov 2019, 11:37
Mohammadmo wrote:
Actually I think the answer would be 100 ms but there is no such an option among the options.
Can some one correct my answer?

Mohammadmo

Do you need to divide it by 2? Just think about it.
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Re: Two trains of equal length are running on parallel lines in the same  [#permalink]

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New post 25 Nov 2019, 03:38
TheNightKing wrote:
Two trains of equal length are running on parallel lines in the same direction at 46 kmph and 36 kmph. The faster train passes the slower train in 36 seconds. The length of each train is:
(a) 82 metre
(b) 50 metre
(c) 80 metre
(d) 72 metre
(e) 90 metre



Let assume the length of each train is x

Total length of both trains = 2x

Relative speed = 46 - 36 = 10 km = 10 * 5/18 meter / sec = 25/9 per sec.

2x/ (25/9) = 36

2x *9 /25 =36

x = 50 meters.

B is the correct answer..........
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Re: Two trains of equal length are running on parallel lines in the same  [#permalink]

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New post 27 Nov 2019, 07:46
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KSBGC wrote:
TheNightKing wrote:
Two trains of equal length are running on parallel lines in the same direction at 46 kmph and 36 kmph. The faster train passes the slower train in 36 seconds. The length of each train is:
(a) 82 metre
(b) 50 metre
(c) 80 metre
(d) 72 metre
(e) 90 metre



Let assume the length of each train is x

Total length of both trains = 2x

Relative speed = 46 - 36 = 10 km = 10 * 5/18 meter / sec = 25/9 per sec.

2x/ (25/9) = 36

2x *9 /25 =36

x = 50 meters.

B is the correct answer..........


I think then we need to mention in question that one train is after another train because in question it is mentioned they both are running parallel as if their engine is at same level. Of course we can see options and then correct it.
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Re: Two trains of equal length are running on parallel lines in the same   [#permalink] 27 Nov 2019, 07:46
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