One third of a certain journey is covered at the rate of 25 km/hr, one forth at

Question

One third of a certain journey is covered at the rate of 25 km/hr, one forth at the rate of 30 km/hr and the rest at 50 km/hr. The average speed for the whole journey is :

Options:

A . 35 km/hr

B . $$33\frac{1}{3}$$ km/hr

C . 30 km/hr

D . $$37\frac{1}{12}$$ km/hr

Answer: Option B

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