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

### Instruction:
Jamir and his two friends Sarah and Julien, go to their school's swimming pool to swim. Jamir swims 20 more meters per day than Sarah, who swims twice the distance Julien swims. They go to the swimming pool the whole week, swimming the same distances as before. If Julien swam 50 meters, what's the combined distance for three of them for the whole week?

### Response:
 Ikiwa Julien aliogelea kwa wiki nzima, basi umbali jumla katika mita alioufikia ni 50*7 = <<50*7=350>>350 mita
Sarah aliogelea mara mbili ya umbali alioufikia Julien, ambao ni 2*50 = <<2*50=100>>100 mita
Umbali jumla wa Sarah kwa wiki nzima ni 100*7 = <<100*7=700>>700 mita.
Ikiwa Jamir aliogelea mita 20 zaidi ya Sarah, alifika mita 100+20 = <<20+100=120>>120 kila siku
Kwa wiki nzima, Jamir alifika mita 120*7 = <<120*7=840>>840
Umbali uliofikiwa na wote watatu ni 840+700+350 = <<840+700+350=1890>>1890 mita