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Nilu covers a distance by walking for 6h...

Nilu covers a distance by walking for 6h. While returning, his speed decreases by 2km/ h and he takes 9 h to cover the same distance. What was her speed while returning?

A

a. 2 km/h

B

b. 5 km/h

C

c. 4 km/h

D

d. 7km/h

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The correct Answer is:
C
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