A man travels 40 km at speed 20 km/h and next 60 km at 30 km/h and there after travel 80 km at 40 km/h. His average speed is

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A man travels 40 km at speed 20 km/h and next 60 km at 30 km/h and there after travel 80 km at 40 km/h. His average speed is

A30 km/h

B25 km/h

C20 km/h

D15 km/h

Answer:

A. 30 km/h

Read Explanation:

Time taken for the first 40 km = 40/20 = 2 h Time taken for the next 60 km = 60/30 = 2 h Time taken for the next 80 km = 80/40 = 2 h Total time = 2 + 2 + 2 = 6 h Total distance = 40 + 60 + 80 = 180 km Average speed = Total distance/Total time = 180/6 = 30 km/h

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