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One third of a certain journey is covere...

One third of a certain journey is covered at the rate of 25km/hours, one -fourth at the rate of 30 km/hour and the rest at 50km/hours. The average speed for the whole journey is

A

35km/hour

B

`33(1)/(3)` km/hour

C

30km/hour

D

`37 (1)/(12)` km/hour

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Verified by Experts

The correct Answer is:
B
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