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A bus travelled the first one-third dist...

A bus travelled the first one-third distance at a speed of `10 km//h`, the next one-third at `20 km//h` and the last one-third at `60 km//h`. The average speed of the bus is

A

`9 km//h`

B

`16km//h`

C

`18km//h`

D

`48 km//h`

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The correct Answer is:
C
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