Question

A car Travels 30 km at a uniform speed of 40 km/h and next 30 km at 20 km/h .find average speed

Answer 1

We have,

For first part,

Distance, s = 30km
Speed, v = 40km/h

Time, t = 30/40 = 3/4 s

For second part,

Distance, s = 30km
Speed, v = 20km/h

Time, t = 30/20 = 3/2 s

Now,

Total time = 3/4 + 3/2 = 3 + 6/4 = 9/4 s = 2.25 s
Total distance = 30+30 = 60km

Average speed, V = Total distance/Total time = 60/2.25 = 26.67 km/h

Answer 2

hope it is helpful for you