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 (in kmph) of the current is

`1 "Km hr"^(-1)`

`1.5 "Km hr"^(-1)`

`2 "Km hr"^(-1)`

`2.5 "Km hr"^(-1)`

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