A boatman row to a place 45 km distan...

A boatman row to a place 45 km distant and back in 20 hours. He finds that he can row 12 km with the stream in the same time as 4 km against the stream. Find the speed of the stream.

3 km/hr

2.5 km/hr

4 km/hr

3.5 km/hr

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