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31 Mar 2019, 03:56
Kudos
Bookmarks
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:
64% (02:21) correct
36%
(02:04)
wrong
based on 294
sessions
History
Date
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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
Posted from my mobile device
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
31 Mar 2019, 05:02
Kudos
Bookmarks
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
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
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
General Discussion
31 Mar 2019, 05:10
Kudos
Bookmarks
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
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
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)
