1.

9. A car has to cover the distance 60 km. If half of thetotal time, it travels with velocity 80 km/hr and inrest half time, its speed becomes 40 km/hr, then theaverage speed of car will be(1) 60 km/hr(3) 120 km/hr(2) 80 km/hr(4) 180 km/hr

Answer»

The problem can be solved by two methods

Method 1 :

Vav= 80 + 40 / 2

= 120/2

= 60 km /h

Method 2 :

Let the half time intervals be t

Therefore 60 = 80t + 40t

t=1/2

total time = 1/2*2 = 1hr

vav= Total distance / Total time

= 60 / 1

= 60 km/h



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