*km/hr to m/s conversion:*

*a*km/hr =*a*x5 m/s. 18 *m/s to km/hr conversion:*

*a*m/s =*a*x18 km/hr. 5 **Formulas for finding Speed, Time and Distance**- Time taken by a train of length
*l*metres to pass a pole or standing man or a signal post is equal to the time taken by the train to cover*l*metres. - Time taken by a train of length
*l*metres to pass a stationery object of length*b*metres is the time taken by the train to cover (*l*+*b*) metres. - Suppose two trains or two objects bodies are moving in the same direction at
*u*m/s and*v*m/s, where*u*>*v*, then their relative speed is = (*u*-*v*) m/s. - Suppose two trains or two objects bodies are moving in opposite directions at
*u*m/s and*v*m/s, then their relative speed is = (*u*+*v*) m/s. - If two trains of length
*a*metres and*b*metres are moving in opposite directions at*u*m/s and*v*m/s, then:

The time taken by the trains to cross each other = ( *a*+*b*)sec. ( *u*+*v*) - If two trains of length
*a*metres and*b*metres are moving in the same direction at*u*m/s and*v*m/s, then:

The time taken by the faster train to cross the slower train = ( *a*+*b*)sec. ( *u*-*v*) - If two trains (or bodies) start at the same time from points A and B towards each other and after crossing they take
*a*and*b*sec in reaching B and A respectively, then:(A’s speed) : (B’s speed) = (b : a)

Problems on Trains Quiz No1 | Problems on Trains Quiz No2 | Problems on Trains Quiz No3 |