Question

A car travels first 40 km at a speed of 40 km/hr . next 50 km at a speed of 50 km/hr and the last 30 km at a speed of 60 km/hr. find the avg speed

Answer 1

Average speed = Total distance travelled/Total time taken

1st Case :

Time = Distance/speed

Time = 40/40

= 1 hour

2nd Case :

Time = Distance/speed

Time = 50/50

= 1 hour

3rd Case :

Time = Distance/speed

Time = 30/60

= 1/2 hour

Average speed = Total distance travelled/Total time taken

= 40 + 50 + 30/ 1 + 1 + 1/2

= 120/5/2

= 120 x 2

5

= 48 Km/H

Answer = 48 Km/h