Question

Perry can fill a sorter with oranges from the conveyer belt in 10 minutes. While Perry fills the sorter, Gillian takes oranges out of the sorter and puts them in shipping crates. With Gillian taking oranges out of the sorter, it takes 25 minutes for Perry to fill the sorter.

Which of the following can be used to determine the amount of time it takes for Gillian to empty the sorter if Perry does not add oranges

1 over 10 minus 1 over x equals 1 over 25
1 over 10 plus 1 over 25 equals 1 over x
1 over 25 minus 1 over x equals 1 over 10
1 over 10 minus 1 over x equals x over 25