If you don’t understand how to do it then it’s fine have a good day

Aswimming pool has an input pump for filling the pool and an output pump for emptying the pool. the input pump can fill the pool in 3 hours, and the output pump can drain the pool in 5 hours. as you go to bed, the pool is full, but a neighbor’s kid turns on the output pump. at midnight, you awake to find the pool half empty. immediately, you turn on the input pump, but you are sleepy and forget to turn off the output pump. at what time will the pool become full?

Solutions for 2x+7 less than or equal to 3x-5

The border line of the linear inequality 4x + 7y < 5 is dotted true or false?