六年级有关进水管和排水管应用题

1.设X分钟5261可将水4102池注满1653.
(1/12-1/15)X1-5/6
1/60X1/6
X10
等式专:(1-5/6)÷属(1/12-1/15)
1/6 /÷ 1/60
10(分)
2.[ 1-(1/15+1/12)×5]÷1/10
[1-3/4]÷1/10
1/4÷1/10
5/2(天)2.5(天)