a swiming pool can be filled in 12 hours and emptied in 15 hours. One day while the pool is being filled, the drain is accidentally left open. It is discovered after 3 hours and the drain is closed. How much longer will it take to fill the pool? Write an equation and solve it. ____I have been trying to write the equation, but seem like I am mistaking somewhere. If I have the right equation , I don't have a problem solving it, so Please help me anyone. Thank you!