Question

a car travels at speed of 80km/h during the first half of its running and time and at 40km/h during the other half.find the average speed of a car 60km/h​

Answer 1

Answer:

when time is same , avg vel = (V1 + V2)/2

here avg vel =( 80 + 40)/2 ===> 60 km / h

Answer 2

For first half, distance=v1t/2.........for second half, distance=v2t/2

Average speed=v1t/2+v2t/2 the whole divided by t/2+t/2

                   =v1t+v2t/2/t

                   =v1+v2/2

 

                    80+40/2 = 60 km/h