A) 16 sec
B) 12 sec
C) 10 sec
D) 8sec
Correct Answer: D
Solution :
Here: Length of train l = 120 m Speed of train =\[{{\upsilon }_{train}}\]10m/s towards west Speed of bird=\[{{\upsilon }_{bird}}\]m/s towards east The relative velocity of bird with respect to the train \[\upsilon ={{\upsilon }_{train}}+{{\upsilon }_{bird}}=10+5=15\,m/s\] Hence, time taken to cross the train is \[=\frac{s}{\upsilon }=\frac{120}{15}=8\,\sec \]You need to login to perform this action.
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