Josh has two leaking pipes in his basement. While waiting for the plumber to come, Josh put a bucket under each week. The two buckets each hold the same amount of water. The bucket under the first week fills in 20 minutes. The bucket under the second leak fills in 35 minutes. Josh's brother takes away one of the buckets and place is the one bucket underneath under the two leaks. About how long will it take for the one bucket to fill completely? (write an equation and solve)