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Q.
A train overtakes two girls who are walking in the opposite direction in which the train is going at the rate of 3 km/h and 6km/h and passes them completely in 36 seconds and 30 seconds respectively. The length of the train is:
A.
120m
B.
150m
C.
125m
D.
None of these
View Answer
Correct choice: B
Explanation:
Let the length of the train e x meter, and let the speed of train be y km/h, then x=(y+3)×5/18×36 --------(1) and x=(y+6)×5/18×30 ---------(2) From eq (1) and (2), we get y = 12 km/h Therefore, x=(y+3)×5/18×36 => x= 150 m
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