Bob and nina can make 7 leashes in 2 hours and nina can make 4 leashes in 1 hour

Question

Enter an equation that can be used to find the number of hours,t, it takes bob and nina to make 60 leashes together.

enter the number of hour,t, it takes bob and nina to make 60 leashes together.

Answer 1

Here is how I like to understand these problems.

Think of each equation as Time X (Total Rate of Production) = Total Produced.

The first sentence tells us that

2 (N/1 + B/1) = 7, where L is how many leashes Nina can make in one hour, and B is the number of leashes Bob can make in one hour.

The second sentence tells us that N = 4.

Can you formulate the last sentence from here?