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

### Instruction:
TJ ran a 10K race last Saturday. He ran the first half in 20 minutes. He completed the second half in 30 minutes. What was his average time per kilometer?

### Response:
 Aliendesha kilomita 10 kwa jumla ya dakika 20 + 30 = <<20+30=50>>50.
Hivyo, aliendesha kwa kasi ya dakika 50 / 10 kilomita = <<50/10=5>>5 dakika kwa kila kilomita.