km/hr to m/s conversion:
| a km/hr = |  | a x | 5 |  | m/s. |
| 18 |
m/s to km/hr conversion:
| a m/s = | | a x | 18 | | 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 bmetres 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 um/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 um/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 atu 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 atu 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)
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