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

### Instruction:
Kevin is taking a 600-mile trip, traveling at a rate of 50 miles per hour. How much faster must he travel to decrease his travel time by 4 hours?

### Response:
 Kwanza tafuta muda wake wa sasa wa safari 600 maili / 50 maili kwa saa = <<600/50=12>>12 masaa.
4 masaa = 12 masaa - 8 masaa = 4 masaa.
600 maili / 8 masaa = 75 maili kwa saa.
75 maili kwa saa - 50 maili kwa saa = <<75-50=25>>25 maili kwa saa.