Aptitude - Time and Distance

Speed, Time and Distance:

Speed =		Distance		,	Time =		Distance		,	Distance = (Speed x Time).
		Time					Speed

km/hr to m/sec conversion:

x km/hr =		x x	5		m/sec.
			18

m/sec to km/hr conversion:

x m/sec =		x x	18		km/hr.
			5

If the ratio of the speeds of A and B is a : b, then the ratio of the

the times taken by then to cover the same distance is	1	:	1	or b : a.
	a		b

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		km/hr.
		x + y