A boat sails downstream 50 km in 2 hours and maintains a speed of 10 km/h while travelling upstream. Find the speed of the boat in still water.

A boat sails downstream 50 km in 2 hours and maintains a speed of 10 km/h while travelling upstream. Find the speed of the boat in still water.
1). 17.5 km/h
2). 18 km/h
3). 40 km/h
4). 50 km/h

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