A car travels the first one-third of a certain distance with a speed of 10 km/hr

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A car travels the first one-third of a certain distance with a speed of 10 km/hr, the next one-third distance with a speed of 20 km/hr, and the last one-third distance with a speed of 60 km/hr. The average speed of the car for the whole journey is :

Options:

A . 18 km/hr

B . 24 km/hr

C . 30 km/hr

D . 36 km/hr

Answer: Option A

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