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Answer:Step-by-step explanation:Number of leashes Bob can make in 2 hours = 7Number of leashes Bob can make in 1 hour = 7÷2 = 3.5Let, Bob takes total x hours.Number of leashes Nina can make in 1 hour = 4Let, Nina takes total x hours.∴ The equation that can be used to find the number of hours it takes bob and Nina to make 60 leashes is given by-3.5x+4x = 60.7.5x = 60This equation can be used to find the number of hours taken by Bob and Nina by putting different values of x and y which satisfies above equation....