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Fantik211

Ответ:

10 часов

Пошаговое объяснение:

1) 1 : 6 = 1/6 (поля - вспашут поле оба трактора за 1 ч.)

2) 1 : 15 = 1/15 (поля - вспашет первый трактор за 1 ч.)

3) 1/6 - 1/15 = 5/30 - 2/30 = 3/30 = 1/10 (поля - вспашет второй трактор за 1 ч)

4) 1 : 1/10 = 1 * 10 = 10 (ч)


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