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28 Apr 2021, 05:45
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
68% (01:29) correct
32%
(02:06)
wrong
based on 138
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A train crosses a pole in 15 seconds while it crosses a 100 m long platform in 25 seconds. What is the length of the train ?
A. 110 m
B. 120 m
C. 130 m
D. 140 m
E. 150 m
A. 110 m
B. 120 m
C. 130 m
D. 140 m
E. 150 m
Thelegend2631
Posts: 371
28 Apr 2021, 05:58
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Length of train is d
Length of platform is 100
D/v = 15 - (1)
D+100 / v = 25 - (2)
Using above equations.
D/D+100 = 3/5
Tip - instead of solving. Since you know difference in ratio which is 2x
2x should correspond to (D+ 100 - D) = 100
Since 2x is 100 hence 3x is 150. 3x corresponds to num. hence answer 150.
Posted from my mobile device
Length of platform is 100
D/v = 15 - (1)
D+100 / v = 25 - (2)
Using above equations.
D/D+100 = 3/5
Tip - instead of solving. Since you know difference in ratio which is 2x
2x should correspond to (D+ 100 - D) = 100
Since 2x is 100 hence 3x is 150. 3x corresponds to num. hence answer 150.
Posted from my mobile device
28 Apr 2021, 06:00
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When speed is constant then distance is directly proportional to the time
Therefore, D1=length of the train (l) only as pole length is assumed to be zero.
And D2 = length of train + length of length of platform i.e. l+ 100.
Times are given in the question.
Thus,
l/(100+l) = 15/25
Solving this , l =150. OA
Posted from my mobile device
Therefore, D1=length of the train (l) only as pole length is assumed to be zero.
And D2 = length of train + length of length of platform i.e. l+ 100.
Times are given in the question.
Thus,
l/(100+l) = 15/25
Solving this , l =150. OA
Posted from my mobile device
