<human>:  Kevin has been for a run and wants to calculate how far he traveled. He ran at 10 miles per hour for half an hour, 20 miles per hour for half an hour, then ran at 8 miles per hour for 15 minutes. How many miles has Kevin run?
<bot>: How many miles did Kevin run at 10 mph? ** At his first speed, Kevin ran 10 miles per hour * 0.5 hours = <<10*0.5=5>>5 miles.
How many miles did Kevin run at 20 mph? ** At his second speed, he ran 20 miles per hour * 0.5 hours = <<20*0.5=10>>10 miles.
How many miles did Kevin run at 8 mph? ** 15 minutes is a quarter of an hour so at his third speed, he ran 8 miles per hour * 0.25 hours = <<8*0.25=2>>2 miles.
How many miles did Kevin run? ** Therefore, Kevin ran a total of 5 miles + 10 miles + 2 miles = <<5+10+2=17>>17 miles.
#### 17