| 1. | Speed = [Distance/Time],
Time=[Distance/Speed],
Distance = (Speed*Time) |
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| 2. | x km/hr = [x*5/18] m/sec. |
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| 3. | If the ratio of the speeds of A and B is a:b, then the ratio of the times taken by them to cover the same distance is 1/a : 1/b or b:a. |
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| 4. | x m/sec = [x*18/5] km/hr. |
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| 5. | Suppose a man covers a certain distance at x km/hr and an equal distance at y km/hr. then, the average speed during the whole journey is [2xy/x+y] km/hr. |
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