17. A railway train. 150 m long and travelling at a
uniform speed of 45 km h crosses a tunnel
900 m long. The time taken by the train to cross the tunnel is
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Answer:
84s
Explanation:
45kmph = 45*5/18= 12.5m/s
total length covered by train=900m + 150m = 1050m
velocity =Dispacement /time
V= 1050 m /(12.5 m/s)
t = 84s
time is taken to cross the bridge is 84 seconds
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