Quantitative Aptitude Free-Study Notes
13.
TIME AND DISTANCE
A.
Speed, Time and Distance:
Speed =
Distance / Time
B.
km/hr to m/sec conversion:
C.
m/sec to km/hr conversion:
D.
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.
E.
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.
Time =
Distance / Speed
Distance =
(Speed x Time)
x km/hr = x * 5/18 m/sec.
x m/sec = x * 18/5 km/hr.