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A sailor sails a distance of 48 km along...

A sailor sails a distance of 48 km along the flow of a river in 8 h.If it takes 12 h to return the same distance,then the speed of the flow of the river is

A

0.5 km/hr

B

1 km/hr

C

1.5 km/hr

D

2 km/hr

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