The Basic formula to be applied is given as:-
1. Distance = Speed x time
4. If the speed of a body is changed in the ratio a : b, the time taken changes in the ratio b : a
5. If a certain distance is covered at x km/hr and the same distance is covered at y km/hr then the average speed during the whole journey is
6. To convert a speed in km per hour to meters per second, multiply it by
7. To convert a speed in meters per second to km per hour, multiply it by
The above factor is obtained as follows :
| | 1 km/hr =
|
1 km | |
| | =
|
1000 m | |
| | =
|
5 | m / sec |
| 1 hour |
| 3600 sec |
| 18 |
Thus, in short 18 kmph = 5 m/sec
Observe that, that due to the above factor, the speeds given in the questions of the competitive examinations are normally in multiples of 18, or, at least in multiples of 9.
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