A) 58 s
B) 68 s
C) 78 s
D) 88 s
Correct Answer: D
Solution :
Key Idea: Total distance covered by train is sum of train?s length plus length of bridge. Total time taken by train to cross the bridge \[=\frac{\text{Total distance}}{\text{Velocity}}\] Total distance=Length of train + Length of bridge=100+1000=1100 m Velocity of train=45 km/h \[=\frac{45\times 5}{18}=12.5\,\,m/s\] \[\therefore \] \[t=\frac{1100}{12.5}=88\,\,s\]You need to login to perform this action.
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