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

### Instruction:
 Inachukua dakika 10 kusafisha gari, dakika 15 kubadilisha mafuta, na dakika 30 kubadilisha seti ya matairi. Ikiwa Mike anasafisha magari 9, anabadilisha mafuta ya magari 6, na anabadilisha seti mbili za matairi, alifanya kazi kwa saa ngapi?


### Response:
 Alitumia dakika 10 * magari 9 = <<10*9=90>>90 kusafisha magari.
Alitumia dakika 15 * magari 6 = <<15*6=90>>90 kubadilisha mafuta.
Alitumia magari 2 * dakika 30 = <<2*30=60>>60 kubadilisha matairi.
Alitumia jumla ya dakika 90 + dakika 90 + dakika 60 = <<90+90+60=240>>240.
Alitumia dakika 240 / dakika 60 = <<240/60=4>>4 saa kwenye kazi hizi.