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
- (a)18 km/hr
- (b)24 km/hr
- (c)30 km/hr
- (d)36 km/hr
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Official answer(a) 18 km/hr