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

### Instruction:
If Natasha was going 10 mph over the speed limit and it took her an hour to arrive at her destination that was 60 miles away, what was the speed limit?

### Response:
 Kikomo cha kasi ni 70 mph kwa sababu Natasha alikuwa anatembea kwa kasi ya 80 mph.