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

### Instruction:
 Bianca worked for 12.5 hours last weekend. Celeste worked for twice that amount of time and McClain worked 8.5 hours less than Celeste. How many minutes did the 3 people work in total?


### Response:
 Bianca = <<12.5=12.5>>12,5 heures
Celeste = 2 * 12,5 = <<2*12.5=25>>25 heures
McClain = 25 - 8,5 = <<25-8.5=16.5>>16,5 heures
Total des heures = 12,5 + 25 + 16,5 = <<12.5+25+16.5=54>>54 heures
Total des minutes = 54 heures * 60 minutes/heure = 3240 minutes