Question

Nếu bể không có nước, người ta mở vòi thứ nhất thì sau 3 giờ bể sẽ đầy, còn mở vòi thứ 2 thì sau 5 giờ bể sẽ đầy. Khi bể không có nước người ta mở vòi thứ nhất trong 1 giờ rồi sau đó mở tiếp vòi thứ 2 cùng chảy. Hỏi hai vòi cùng chảy tiếp sau bao lâu bể sẽ đầy?

Answer 1

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Answer 2

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Answer 3

giải rõ ra hộ mình