Please solve it fast. A train 280 m long crosses the bridge 170 m in 22.5 seconds. Find the speed of the train in km/h.
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Answer:
length of the train =250m
length of the bridge =170m
therefore, length of the train+length of the bridge=280m+170m=450m
time taken by the train to cross the bridge =22.5 sec =45/2 sec
Therefore speed of the train = 450 m/22.5m/sec= 450/45/2m/sec=20 m/sec
to convert the speed to km/hr multiply by 18/5
therefore speed of the train=20*18/5km/hr =72 km/hr
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