Below is an instruction that describes a task. Write a response that appropriately completes the request in French. Please answer in French.

### Instruction:
 Peter is raking leaves. It takes him 15 minutes to rake 3 bags of leaves. If he keeps raking at the same rate, how long will it take him to rake 8 bags?


### Response:
 Il ratisse 3 sacs / 15 minutes = <<3/15=0.2>>0,2 sacs par minute.
Il lui faudra 8 sacs / 0,2 sacs par minute = <<8/0.2=40>>40 minutes pour ratisser 8 sacs de feuilles.