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In one hour, a boat goes at 20 km/hr along the river and 4 km/hr against the river. The speed of the boat in

In one hour, a boat goes at 20 km/hr along the river and 4 km/hr against the river. The speed of the boat in still water (in km/hr) is: 1. 12 km/hr 2. 11 km/hr 3. 10 km/hr 4. 8 km/hr 5. 6 km/hr

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