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A man divides his total route of journey...

A man divides his total route of journey into three equal parts and decides to travel the three parts with speed of 15 km/h, 10 km/h and 5 km/h, respectively. Find his average speed of during journey.

A

2.28 km/h

B

9km/h

C

14 km/h

D

8.18 km/h

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The correct Answer is:
D
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