Vòi thứ nhất chảy 1 mình vào cái bể mà không có nước thì sau 3 giờ bể đầy. Vòi thứ 2 chảy 1 mình vào bể không nước thì sau 6 giờ bể đầy. Vậy nếu 2 vò cùng chảy vào bể hông có nước đó thì sau ... giờ đầy bể
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Thời gian hai cái bể chảy nước là :
1/3 + 1/6 = 1/2
Thời gian chảy đầy bể nước là :
1 : 1/2 = 2 ( gio )
Đáp số ; 2 giờ
Nhớ k mình nha
2 giờ đúng 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%