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

### Instruction:
Karen is paddling her canoe up a river against the current. On a still pond, Karen can paddle 10 miles per hour. The river flows in the opposite direction at 4 miles per hour. If the river is 12 miles long, how many hours will it take Karen to paddle up it?

### Response:
 Kwanza tafuta kasi ya neti ya Karen kwa kutoa kasi ya mkondo: 10 mph - 4 mph = <<10-4=6>>6 mph
Kisha ugawanye urefu wa mto kwa kasi ya Karen ili kujua muda gani anachukua kuvulia juu yake: 12 maili / 6 mph = <<12/6=2>>2 masaa