Question

a passenger train travelled

Answer 1

the relative speed of goods is 72-54 = 18km/h
=18×(5/18) m/s
= 5m/s

now time taken by the goods train to pass=8sec.
now distance = speed × time
= 5×8
= 40m
therefore length of the goods train is 40m.

Answer 2

relative speed = 72-54=18 km/he
=18×5/18=5 m/sec
time taken=8 seconds
distance = speed×time
= 5×8= 40 m

thus the length of the train was 40 m