on a journey across delhi, a taxi average 30 kmph for 60% of the distance, 20

Question

on a journey across delhi, a taxi average 30 kmph for 60% of the distance, 20 kmph for 20% of it and 10 kmph for the remainder, the average speed for the whole journey is ?

Options:

A . 5 km/hr

B . 10 km/hr

C . 15km/hr

D . 20 km/hr

Answer: Option D
Explanation :

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