Question

a car moves for half of its time at 80km/hr and for rest half of time as 40km/hr .Total distance travelled is 60km .Find the average speed.

Answer 1

average speed=total distance covered/total time taken Let total time taken to cover the distance=2Tso total distance=60=80T+40T   ........accordinglyT=1/2  hrso avg speed=60/2T=60 km/hr