A swimming pool can be filled in 11 hours if water enters through a pipe alone, or in 21 hours if water enters through a hose alone. If water is entering through both the pipe and the hose, how long will it take to fill the pool?
231/5000
Бассейн можно заполнить за 11 часов, если вода поступает только через трубу, или через 21 час, если вода поступает только через шланг. Если вода входит через трубу и шланг, сколько времени потребуется, чтобы наполнить бассейн?
Basseyn mozhno zapolnit' za 11 chasov, yesli voda postupayet tol'ko cherez trubu, ili cherez 21 chas, yesli voda postupayet tol'ko cherez shlang. Yesli voda vkhodit cherez trubu i shlang, skol'ko vremeni potrebuyetsya, chtoby napolnit' basseyn?
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