Bottle falls during Boating \(\ddot \frown\)

A boat travels upstream in a river with a constant but unknown speed \(v\) with respect to water. At the start of this trip upstream, a bottle is dropped over the side. After \(7.5~minutes\) the boat turns around and heads downstream. It catches up the bottle when the bottle has drifted \(1~km\) downstream from the point at which it was dropped into the water. Then the velocity of water current is (in \(km/hr\))

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