Question

a car travels first at 30 km at a constant speed of 30km per hour . if the total distance is 120 km them, how much fast the car travel to next distance so as to average speed 60 km per hour for entire trip​

Answer 1

Answer:

average speed = total distance/total time

60=120/t

t=2hrs

time taken for first 30 km= 30/30=1hr

time taken for next 90km= 90/s

therefore, as we know time taken for the rest 90 km would be 1hr

1=90/s

speed = 90km/h