A man rows a boat to a place at a distance of 60 km and back in 18 hours. He finds that the boat can row 15 km with stream at the same time as 12 km against the stream. Find the speed of the boat in still water.

1
6.25 km/hr
2
6.75 km/hr
3
4.21 km/hr
4
5 km/hr
5
5.75 km/hr

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