Doing the lawn

This task is about working out the cost of cutting a lawn.
 

Question

Jamie charges $15 per hour worked, plus an additional $20 if he has to bring his own mower.
 
Mrs Gabo has no mower and was charged $65 to have her lawns done.
How long did the job take?

    • 1 hour

    • About 2 hours

    • 3 hours

    • About 3 1⁄2 hours

    • About 4 hours

Show or explain how you decided on your answer.