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

### Instruction:
Mark and his sister Chris both leave their house for school at the same time.  Mark travels at the same speed as Chris, who walks 3 miles per hour. After walking 3 miles Mark has to turn around and go home because he forgot his lunch. If the distance from their house to the school is 9 miles, how much longer does Mark spend walking than Chris?

### Response:
 Kwanza tafuta jumla ya maili ambazo Mark anatembea kurudi nyumbani kwa kuzidisha umbali anatembea kurudi nyumbani mara mbili: 3 maili * 2 = <<3*2=6>>6 maili
Kisha tafuta jumla ya umbali ambao Mark anatembea kwa kuongeza umbali huo na umbali kati ya nyumba na shule: 6 maili + 9 maili = <<6+9=15>>15 maili
Sasa gawanya jumla ya umbali ambao Mark anatembea kwa kasi yake ili kupata saa ngapi anatumia kutembea: 15 maili / 3 maili/saa = <<15/3=5>>5 saa
Sasa gawanya jumla ya umbali ambao Chris anatembea kwa kasi yake ili kupata muda jumla anatumia kutembea: 9 maili / 3 maili/saa = <<9/3=3>>3 saa
Sasa toa muda ambao Chris anatumia kutembea kutoka kwa muda ambao Mark anatumia kutembea ili kupata tofauti: 5 saa - 3 saa = <<5-3=2>>2