English maths
It is quiet easy I think……(let the totall volumn needed to be filled is 1)The time taken by the hose to fill the pool ……2hSo the speed of the hose to fill the pool is 1/2hThe time taken by the faulty outlet to empty the pool……。 。10hSo the speed of the outlet to empty the pool is 1/10hThe water ru...全部
It is quiet easy I think……(let the totall volumn needed to be filled is 1)The time taken by the hose to fill the pool ……2hSo the speed of the hose to fill the pool is 1/2hThe time taken by the faulty outlet to empty the pool……。
。10hSo the speed of the outlet to empty the pool is 1/10hThe water runs into the pool and runs out of the pool starts together。
1/(1/2-1/10)=10/4=2。5h。收起
