<human>:  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?
<bot>: How long does it take Kevin to travel 600 miles? ** First find his current travel time 600 miles / 50 miles per hour = <<600/50=12>>12 hours.
How much time does Kevin want to save? ** 12 hours - 4 hours = <<12-4=8>>8 hours desired travel time
How fast must Kevin travel to save 4 hours? ** 600 miles / 8 hours = <<600/8=75>>75 miles per hour.
How fast must Kevin travel to save 4 hours? ** 75 miles per hour - 50 miles per hour = <<75-50=25>>25 miles per hour faster
#### 25