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

### Instruction:
Martin went on an eight-hour business trip. During the first half of the trip, he traveled at a speed of 70 kilometers per hour and during the second half at a speed of 85 kilometers per hour. How many kilometers did he travel during the journey?

### Response:
 Nusu ya safari inadumu kwa masaa 8 * 0.5 = <<8*0.5=4>>4.
Nusu ya kwanza ya safari Martin alisafiri kwa kasi ya kilomita 70 kwa saa, hivyo 4 * 70 = <<4*70=280>>280 kilomita.
Nusu ya pili ya safari Martin alisafiri kwa kasi ya kilomita 85 kwa saa, hivyo 4 * 85 = <<4*85=340>>340 kilomita.
Jumla, Martin alisafiri kilomita 280 + 340 = <<280+340=620>>620 wakati wa safari yake ya biashara.