The boat sailed 1.4 hours along the river and 0.6 hours against the current, covering only 32.8 km. At what speed did the boat go with the current, did it go against the current at a speed of 15 km / h?
Stot = Vpo * tpo + Vпр * tпр is the formula for the total distance traveled by the boat upstream and downstream
Substitute the values known by assignment into the above formula:
32.8 = Vpo * 1.4 + 15 * 0.6
32.8 = Vpo * 1.4 + 9
23.8 = Vpo * 1.4
Vpo = 17 km / h – the required speed of the boat downstream
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