Предмет: Математика, автор: kamilaMila777

УМОЛЯЮ СРОЧНО ПОМОЧЬ Два насоса наполняют бассейн за 3 часа. Сколько часов потребуется первому насосу что бы наполнить бассейн, если второй наполняет бассейн за 12 часов! Умоляю срочно помочь

Ответы

Автор ответа: savav1

Ответ:

Х- время заполнения всего бассейна 1-м насосом х+10 - время заполнения всего бассейна 2-м насосом 1/х + 1(х+10) = 1/12 12 * (х+10) + 12х = х * (х+10) 12х + 120 + 12х = x^2 + 10x x^2 - 14x - 120 = 0 x1 = 20 x2 = -6 (не удовлетворяет условию) х+10 = 30 ответ: первый - за 10 часов, второй - за 20 часов

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