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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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