Arithmatical - Time and Distance

CATEGORY

Important Facts and Formulae
1.
Speed =
Distance
Time
Time = Distance
Speed
2. Distance = (Speed x Time).
3.

km/hr to m/sec conversion :

x km/hr = (x ×5 / 18 ) m /sec.
4.

m/sec to km/hr conversion: :

x m/sec = (x ×18/ 5 ) km/hr.
5.

If the ratio of the speeds of A and B is a : b, then the ratio of the times taken by then to cover

the same distance is 1 / a : 1 / b or b : a.
6.

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.