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

### Instruction:
Jill has a difficult test to study for.  She decides to study one day for 2 hours.  The next day she doubles this amount, and the day after that she studies one hour less than the previous day.  How many minutes does Jill study over the 3 days?

### Response:
 Kwanza, Jill anasoma kwa saa 2 * dakika 60 = <<2*60=120>>120.
Siku inayofuata anazidisha kiasi hiki hadi dakika 2 * 120 = <<2*120=240>>240.
Siku ya tatu Jill anasoma dakika 240 - 60 = <<240-60=180>>180.
Jumla, Jill anasoma dakika 120 + 240 + 180 = <<120+240+180=540>>540.