If upstream speed is 22 km/hr and downstream speed is 34 km/hr, what is speed of boat in still water?

28 km/hr 56 km/hr 17km/hr 11km/hr

28 km/hr

Let, Speed of boat in still water - x Speed of stream/current - y Upstream speed i.e. x - y = 22 km/hr ------(1) Downstream speed i.e. x + y = 34 km/hr -------(2) Adding 2 equations: x - y + x + y = 22 + 34 2x = 56 x = 28 km/hr