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

### Instruction:
Mary and Ann are going sledding. Mary slides down a hill that's 630 feet long at a speed of 90 feet/minute. Ann slides down a hill that's 800 feet long at a rate of 40 feet/minute. How much longer does Ann's trip take than Mary?

### Response:
 Kwanza tafuta muda jumla wa safari ya Mary: futi 630 / futi 90/dakika = <<630/90=7>>7 dakika
Kisha tafuta muda jumla wa safari ya Ann: futi 800 / futi 40/dakika = <<800/40=20>>20 dakika
Kisha toa muda wa Mary kutoka kwa muda wa Ann ili kupata tofauti: 20 dakika - 7 dakika = <<20-7=13>>13 dakika