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Rani covers a certain distance by car dr...

Rani covers a certain distance by car driving at 5km/h and returns the starting point riding on a scooter at 2 km/h. Find her average speed for the whole journey.

A

`3(6)/(7)`km/h

B

`2(6)/(7)`km/h

C

`5(6)/(7)`km/h

D

`7(6)/(7)`km/h

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The correct Answer is:
B
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