The steamship floated on a watercourse 30 km in 2 hours, and the same distance on the lake - in 3 hours. What speed of a watercourse? A) 2.5 km / B) 3 km/h C) 5 km/h D) 10 km/h

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1) 30:2=15 km/h steamship speed on a watercourse 2) 30:3=10 km/h own speed of the steamship are 3) 15-10=5 km/h the speed of a watercourse of Answer C) 5 km/h watercourse speed.
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Answer add