Question

a train traveling 90 km/h crosses a stationary goods train 200m long in the same direction in 15 s. in how much time will it cross a man moving in the opposite direction at 5m/s
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Answer 1

Step-by-step explanation:

speed of train = 90km/h or 90×1000/3600

= 25m/s

total distance covered by train while crossing goods train will be = sum of length of both trains

= 200+length of train

distance = speed×time

so,

200+ length of train=25×15

=375m

,length of train =375-200

=175m

when train will cross a man moving with speed of 5m/s in opposite direction

so , relative speed = 25m/s +5m/s

= 30m/s

time taken = distance/ relative speed

= 175/30

=5.83 sec