Time and Distance important notes - Aptitude Questions and Answers

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
Suppose a man covers equal distance at x km/hr, y km/hr and z km/hr. Then
the average speed during the whole journey is
3xyz
xy+yz+zx

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

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

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

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

the average speed during the whole journey is		2xy		km/hr.
		x + y