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