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

### Instruction:
The distance between Robin's house and the city center is 500 meters. He leaves the house to go to the city center. After he walks 200 meters he realizes that he forgot his bag. So he returns to his house, then goes back to the city center. How many meters does he walk in total?

### Response:
 Anatembea mita 200 kwanza kisha anarudi nyumbani. Kwa hiyo anatembea mita 200 + mita 200 = <<200+200=400>>400.
Kitovu cha mji kiko mita 500 kutoka nyumbani kwake kwa hiyo umbali jumla ni mita 400 + mita 500 = <<500+400=900>>900.