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

### Instruction:
4 students participated in a 200m race. If the average completion time of the last three students was 35 seconds, and the average completion time of all four runners was 30 seconds, how long (in seconds) did it take the student who came first to finish the race?

### Response:
 Jumla ya muda wa kukamilisha wa wanafunzi watatu wa mwisho ni 35*3 = <<35*3=105>>105 sekunde.
Jumla ya muda wa kukamilisha wa wanafunzi wote wanne ni 30*4 = <<30*4=120>>120 sekunde.
Mwanafunzi wa kwanza alitumia 120-105 = <<120-105=15>>15 sekunde kukamilisha mbio hizo.