3. Motor ship speed on a watercourse of 42.8 km/h. Speed of a watercourse is 2.8 km/h. Find own speed of the motor ship and its speed against the current.

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1) 42.8 - 2.8 = of 40 km/h is own speed of the motor ship 2) 40 - 2.8 = speed against the current is of 37.2 km/h.

42.8-2.8=40 kmch-sobstvo. motor ship speed

40-2.8=37.2km/ch-speed against the current rivers

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Answer add