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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