Question

有一个水池有两个注水管.如果单开甲管,2.5h注满水池,如果单开乙管,5h注满水池.

Answer 1

1.设还需X小时.

(1/2.5+1/5)0.3+1/5x=1

x=4

2.设x小时能把水注满.

(1/2.5+1/5-1/3)x=1

x=3.75