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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
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