A train travelling at 30 km an hour took 13 1/2 sec in passing a certain point ,Find the length ...

A train travelling at 90 km/h crosses a pole in 8 s. Find the length of the train (in m).

A train travelling at 36 km/hr. completely crosses another train having half its length and travelling in the opposite direction at 54 km/hr. in 12 seconds. If it also passes a railway plat form in 1(1)/(2) minutes, the length of the platform is: