Question

a train 360 M long is running at the speed of 45 km/hr . find the time taken by it to cross a 140 m long tunnel

Answer 1

total distance=360 meter long train + 140 meter tunnel

= 500m

speed = 45 km/hr= 45×5/18=12.5m/s

time=distance/velocity

=500/12.5

=40s

time taken by train=40s

Answer 2

speed = 45*(5/18)m/sec
12.5 m/sec
distance = 140+360=500m
time= 500/12.5= 40sec