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A covers 1/4th of his journey at 20 km/h...

A covers 1/4th of his journey at 20 km/h and 1/3rd of the rest at 25 km/h and half of the rest at 30 km/h and rest at the speed of 40 km/h.What is the average speed of A?

A

13(78/89)km/h

B

12 km/h

C

26(86/89)km/h

D

28 km/h

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The correct Answer is:
C
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