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

### Instruction:
Southton buries their time capsule 15 feet underground. Northton buries their time capsule 12 feet higher than 4 times the depth of the Southton time capsule. How deep is Northton's time capsule buried?

### Response:
 Kina cha kisanduku cha wakati cha Southton ni futi 15.
Kina cha kisanduku cha wakati cha Northton ni mara 4 * 15 + 12 = <<4*15+12=72>>72 futi.