A train travelling at 48 kmph completely crosses another train having half its length and travelling in opposite direction at 42 kmph, in 12 seconds. It also passes a railway platform in 45 seconds. The length of the platform is `400\ m` b. `450\ m` c. `560\ m` d. `600 m`

A train travelling at 48 kmph completely crosses another train having half its length and travelling in opposite direction at 42 kmph,in 12 seconds.It also passes a railway platform in 45 seconds.The length of the platform is 400backslash m b.450backslash m c.560backslash m d.600m

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: