How long does a train 110 metres long running at the speed of 72 kmph take to cross a bridge 132 metres in length?
9.8 sec
12.1 sec
12.42 sec
14.3 sec
14.9 sec
Speed = (72×518)m/sec = 20m/sec
Total distance covered = (110+132) m = 242 m
∴Required time = (24220)sec = 12.1 sec.
400 metre long train is to cross a Railway Bridge over the river is the bridges 2.1 km long and the train passes over the bridge at a uniform speed of 36 km per hour how much time does the train take to cross the bridge