Ответ:
1) 15-2,5=12,5 - man's speed without current.
2) 12,5-2,5=10 - man's speed against the current.
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Э грэндфазер (сочетание th читается как звук з только между зубов нужно высунуть кончик языка)
How much bread have you bought. How many guests have you invited. How many meat sandwiches have you made. How much salad have you prepared. How many slices of bread have you cut. How many kilos of apples have you bought.