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

### Instruction:
John starts at an elevation of 400 feet.  He travels downward at a rate of 10 feet down per minute for 5 minutes.  What is his elevation now?

### Response:
 Alishuka futi 10*5=<<10*5=50>>50.
Hivyo, yuko katika kimo cha futi 400-50=<<400-50=350>>350.