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A boat covers 12 km upstream and 18...

A boat covers 12 km upstream and 18 km downstream in 3 hours ,, while it covers 36 km up stream and 24 km downstream in `6(1)/(2)` hours . What is the speed of the current ?

A

2 km

B

2.5 km

C

1.5 km

D

1 km

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