One pump can fill a swimming pool in 8 hours and another pump can fill it in 10 hours. if both pumps are opened at the same time, how many hours will it take to fill the pool?

One pump can fill 5/40 of the pool in an hour(8 hour pump), and the other can fill 4/40 of the pool in an hour(10 hour pump). if both pumps run at the same time, 9/40 of the pool is filled every hour. To fill the pool completely, it will take the pumps roughly 4 hours and 26 minutes.

put like terms together.orremember that the 45 becomes negative when moved to the other side.orthe minuses cancel out.