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The speed of a boat upstream is 12km/h ....

The speed of a boat upstream is 12km/h . If it can travel a distance of 42 km downstream in 3 h, then the speed of the current is

A

2 km/h

B

1.5 km/h

C

0.5 km/h

D

1 km/h

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The correct Answer is:
D
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