Question

A train 270m long takes 20 second to cross a bridge 330m long. Find the speed of the train in km/ hr.

110


108


98​

Answer 1

Answer:

total distance the train have to cover =270+330=600m

time taken=20sec

speed=distance/time

speed of train=(600/20)m/sec

i.e 30m/sec

now,30×60×60/1000=108km/M

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Answer 2

Answer

Length of the train =270m

Length of the bridge = 330m

Distance covered by the train to cross the bridge = (270 + 330) m

= 600m

Time taken by the train to cross the bridge = 20 seconds

secondsSpeed = distance/time

secondsSpeed = distance/time = 600/20 m/sec

0 m/sec = 30m/sec.

formula for converting metre per second into kilometre per hour

X ×18/5

so

30×18/5

=108 km/hr

Hence, train cover 108 km/hour