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

### Instruction:
Rodney and Todd are rowing down a river that is 50 yards wide at one end. If the river's width increases from this end uniformly by 2 yards every 10 meters along, and they row along the river at a rate of 5 m/s, how long (in seconds) will it take them to get to the point where the river is 80 yards wide?

### Response:
 Tofauti ya upana kati ya walipoanza na marudio yao ni mita 80-50 = <<80-50=30>>30.
Tofauti hii ya upana ni sawa na idadi ya ongezeko la mita 2 kwenye mto, hivyo 30/2 = <<30/2=15>>15 ongezeko la mita 10 linahitajika.
Kwa kuwa urefu wa ongezeko moja la mita 10 ni mita 10, urefu jumla watakaozunguka ni 15*10 = <<15*10=150>>150 mita.
Wakipiga chombo kwa kasi ya mita 5 kwa sekunde, itawachukua 150/5 = <<150/5=30>>30 sekunde kufika sehemu yenye upana mkubwa wa mto.