1.

*a km/hr= (a**5/18) m/s.
2. a m

*/ s*= (a*18/5) km/hr.
4.
Time taken by a train of length

*1*metres to pass a stationary object of length*b*metres is the time taken by the train to cover*(1*+*b)*metres.
5.
Suppose two trains or two bodies are moving in the same direction at u m / s and

*v m/s,*where u >*v,*then their relatives speed = (u -*v)*m / s.
6.
Suppose two trains or two bodies are moving in opposite directions at u m / s and

*v m/s,*then their relative speed is = (u +*v)*m/s.
7. If two trains of length

*a*metres and*b*metres are moving in opposite directions at u m*/*s and*v*m/s, then time taken by the trains to cross each other =*(a*+*b)/(u+v)*sec.
8.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)/(u-v) sec.
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