### Home > GB8I > Chapter 11 Unit 12 > Lesson INT1: 11.2.6 > Problem 11-118

11-118.

Robby Robot can make a widget in 7 minutes. With the help of Roger Robot, the job can be done in 4 minutes. How long would it take Roger Robot working alone?

Let the number of minutes for Roger Robot to complete the job.

Robby Robot will make

Write and solve an equation using the format *work rate · time = 1 job*

They are working together, so the total work rate is