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A boat covers a certain distance downstream in 1 hour, while it comes back in 1.5 hour. If the speed of the stream be

A boat covers a certain distance downstream in 1 hour, while it comes back in 1.5 hour. If the speed of the stream be 3 km/hr, what is the speed of the boat in still water? 1. 12 km/hr 9.5 km/hr 3. 14 km/hr 4. 7.5 km/hr 5. None of these 2.

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