A car travels 30km at a uniform speed of 40 km/h and the next 30km at a uniform speed of 20km/h. Find its average speed.
26.7 km/h
Total distance = 30 km + 30 km = 60 km
Time taken to move first 30 km, t1 = 3040 = 34 h
Time taken to cover next 30 km, t2 = 3020 = 32 h
Total time taken = t1 + t2 = 34 + 32 = 94 h
Hence, average speed of the person = Total DistanceTotal Time = 60 km(94 h) = 26.7 km/h