Bob and Nina make dog leashes . Bob can make 7 leashes in 2 hours and nina can make 4 leashes in 1 hour enter an equation that can be used to find the number of hours it takes bob and Nina to make 60 leashes

Nina: 4 leashes X 15 hours = 60 leashes
Bob:  3.5 leashes X 17.1428571428 hours = 60 leashes
(Sorry I couldn't make a fraction out of 17.1428571428)