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

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

8 km/h

9 km/h

16 km/h

18 km/h

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The correct Answer is:

18 km/h

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