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Trong 1 giờ, vòi thứ nhất chảy được 1: 6 = 1/6 bể
Trong 1 giờ, vòi thứ hai chảy đuwocj: 1: 9 = 1/9 (bể)
Trong 1 giờ, cả hai vòi chảy được: 1/6 + 1/9 = 5/18 (bể)
3 giờ đầu, vòi thứ nhất chảy được là: 3 x 1/6 = 1/2 ( bể)
Số phần bể còn lại là: 1 - 1/2 = 1/2 (bể)
Thời gian để cả hai vòi cùng chảy đầy bể là: 1/2 : 5/18 = 9/5 = 1,8 giờ
Công chúa Băng Giá coppy nhầm rồi
ĐS:...
1 giờ vòi 1 chảy:1:3=1/3(bể)
1 giờ vòi 2 chảy:1:5=1/5( bể)
1 giờ cả 2 vòi cùng chảy:1/3+1/5=8/15(bể)
sau 1:8/15=15/8(giờ) thì đầy bể
vậy sau 15/8 giờ-1 giờ=7/8(giờ) thì đầy bể
Bạn làm sai rùi .......