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

### Instruction:
Toby, the Alaskan Malamute, can pull a sled at a speed of 20 miles per hour if the sled is unloaded, but he pulls the same sled at a speed of 10 miles per hour if the sled is fully loaded.  If Toby takes a continuous 4-part journey, first pulling the loaded sled for 180 miles, then pulling the unloaded sled for 120 miles, then pulling the loaded sled 80 miles, and finally, pulling the unloaded sled another 140 miles, how many hours in total will Toby spend pulling the sled?

### Response:
 Kuvuta kizimba kilichobeba mzigo kwa kasi ya maili 10 kwa saa kwa umbali wa maili 180 kunachukua masaa 180/10=<<180/10=18>>18.
Kuvuta kizimba kisichobeba mzigo kwa kasi ya maili 20 kwa saa kwa umbali wa maili 120 kunachukua masaa 120/20=<<120/20=6>>6.
Kuvuta kizimba kilichobeba mzigo kwa kasi ya maili 10 kwa saa kwa umbali wa maili 80 kunachukua masaa 80/10=<<80/10=8>>8.
Kuvuta kizimba kisichobeba mzigo kwa kasi ya maili 20 kwa saa kwa umbali wa maili 140 kunachukua masaa 140/20=7.
Jumla, Toby atatumia masaa 18+6+8+7=<<18+6+8+7=39>>39 kuvuta kizimba.