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A boy travels a distance of 8 km at the ...

A boy travels a distance of 8 km at the rate of 4 km per hour , 6 km at the rate of 3 km per hour and 4 km at the rate of 2 km per hour. What is the average speed for the entire journey ?

A

2 kmph

B

3 kmph

C

4 kmph

D

6kmph

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