a man covered a distance in that 40% road covered 10km/ hour, 15% 20km/hour, rest part 30 km/hour...find the average speed of total distance
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Answer:
Average Speed = Total Distance / Total Time
Total Distance = 40 km
Total Time = T1 + T2 + T3 + T4
Time = Distance / Speed → T1 = 10/10 = 1 hr, T2 = 10/20 = 1/2 hr, T3 = 10/30 = 1/3 hr, T4 = 10/40 = 1/4 hr
T = T1 + T2 + T3 + T4 = 1 + 1/2 + 1/3 + 1/4 = 25/12 hr = 2 hr 5 min
Average Speed = 40 km / 25/12 hr = 19.2 km/h
The average speed of the man is 19.2 kilometres per hour.
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