
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 
