Question

A boy goes to school with average speed of his car 20 km/h and come back from school by the same route with average speed 40 km/h. Find the total average speed i.e home to school and school to home to his car.​

Answer 1

Answer:

26.67 kmph

Explanation:

Distance = d

Time while going to school = d/20

Time while coming home = d/40

Avg speed = Total d/total time = (d+d)/(d/20)+(d/40)

                  = 2d / (3d/40)  = 80/3 = 26.67 kmph