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A boat covers 24 km upstream and 36 km d...

A boat covers 24 km upstream and 36 km downstream in 6 hours while it covers 36 km upstream and 24 km downstream in `6 1/2` hours. The velocity of the current is `1\ k m//h r` b. `1. 5\ k m//h r` c. `2\ k m//h r` d. `2. k m//h r`

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