Предмет: Алгебра, автор: vipna122

Теплоход с туристами отправил...

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Автор ответа: sangers1959

Пусть время, затраченное на поездку - х.
17,5/(18+3)+17,5/(18-3)+3=x
17,5/21+3+17,5/15=x
2,5/3+3+3,5/3=x
6/3+3=x
2+3=x
x=5.
Ответ: поездка длилась 5 часов.

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