Two trains A and B 100 m and 60 m long are moving in opposite direction on parallel tracks. The velocity of the shorter train is 3 times that of the longer one. If the trains take 4s to cross each other, the velocities of the trains are

Answer

`v_(A)=10 ms^(-1), v_(B)=30 ms^(-1)`

Explanation

Let `v_(AB)=v-(-3v)=4v`

time `=160/(4v)=4` sec `v=10 m//s`
velocity of train `v_(A)=10 m//s`
`v_(B)=3xxv=30 m//s`