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A bus travelling the first-one-third dis...

A bus travelling the first-one-third distance at a speed of 10km/h, the next one-fourth at 20 km/h and the remaining at 40km/h. The average speed of the bus is about

A

8km/h

B

9km/h

C

16km/h

D

18km/h

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The correct Answer is:
D
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