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jackfr2
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Two train of equal length running in opposite direction 31 Mar 2019, 03:56
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C
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% (02:18) correct 34% (01:58) wrong based on 389 sessions

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Two train of equal length running in opposite direction, pass a pole in 18 and 12
seconds. The trains will cross each other in ?
a. 12.6 seconds
b. 13.5 seconds
c. 14.4 seconds
d. 15.3 seconds
e. 16 seconds

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C
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Two train of equal length running in opposite direction 31 Mar 2019, 05:02
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jackfr2
Two train of equal length running in opposite direction, pass a pole in 18 and 12
seconds. The trains will cross each other in ?
a. 12.6 seconds
b. 13.5 seconds
c. 14.4 seconds
d. 15.3 seconds
e. 16 seconds

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Let, length of train = 180

First train crosses its length in 18 second
i.e. speed of first train = 180/18 = 10

Second train covers same distance in 12 secs
i.e. speed of first train = 180/12 = 15

To cross each other the distance to be covered = 180+180 = 360
Relative speed = 10+15 = 25
Time = 360/25 = 14.4 secs

Answer: Option C
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Two train of equal length running in opposite direction 31 Mar 2019, 05:10
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jackfr2
Two train of equal length running in opposite direction, pass a pole in 18 and 12
seconds. The trains will cross each other in ?
a. 12.6 seconds
b. 13.5 seconds
c. 14.4 seconds
d. 15.3 seconds
e. 16 seconds

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Let the lenghths of the train be 36 (LCM of 18 & 12)

So Speed of the 2 trains are 2 & 3

Thus, relative speeds of the train moving in opposite direction will be 2 + 3 = 5

So, time taken to cross each other will be \(\frac{36 + 36}{2 + 3}\) = 14.4 , Answer must be (C)
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Two train of equal length running in opposite direction 28 Sep 2019, 04:07
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let distance = x
speed of train 1 ; x/18
speed of train 2 ; x/12
total speed ; 5x/36
total time taken to cross each other ; x+x/5x/36 ; 36*2x/5x ; 14.4 sec
IMO C


jackfr2
Two train of equal length running in opposite direction, pass a pole in 18 and 12
seconds. The trains will cross each other in ?
a. 12.6 seconds
b. 13.5 seconds
c. 14.4 seconds
d. 15.3 seconds
e. 16 seconds

Posted from my mobile device
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Two train of equal length running in opposite direction 21 Oct 2019, 17:05
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Length of one train = LCM (18, 12) = 36
Speed of first train = 36/18 = 2
Speed of second train = 36/12 = 3
Total length (distance) of the two trains = 2(36) = 72
Relative speed = 5
Time to cross each other = 72/5 = 14.4
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Two train of equal length running in opposite direction 31 Mar 2020, 09:52
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jackfr2
Two train of equal length running in opposite direction, pass a pole in 18 and 12
seconds. The trains will cross each other in ?
a. 12.6 seconds
b. 13.5 seconds
c. 14.4 seconds
d. 15.3 seconds
e. 16 seconds

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Given: Two train of equal length running in opposite direction, pass a pole in 18 and 12
seconds.

Asked: The trains will cross each other in ?

Let the length of each train = 36 m

Speed of first train = 2 m/s
Speed of second train = 3 m/s

The trains will cross each other in = 2*36/(2+3) = 72/5 = 14.4 seconds

IMO C
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Two train of equal length running in opposite direction 31 Mar 2020, 19:55
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D=r*18
D=r*12

2D/(d/18+d/12)
2(12*18)/(12+18)
2(216)/(30)
216/15
14.4
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Two train of equal length running in opposite direction 26 Nov 2025, 20:51
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