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

### Instruction:
Theon's ship can move 15 nautical miles per hour while Yara's ship can move 30 nautical miles per hour. If their destination is 90 nautical miles away, how many hours ahead will Yara be ahead of Theon?

### Response:
 Wakati uliokadiriwa wa kuwasili kwa Theon ni 90/15 = <<90/15=6>>6 masaa.
Wakati uliokadiriwa wa kuwasili kwa Yara ni 90/30 = <<90/30=3>>3 masaa.
Hivyo, Yara atakuwa mbele kwa masaa 6 - 3 = <<6-3=3>>3.