human
Jason has to drive home which is 120 miles away. If he drives at 60 miles per hour for 30 minutes, what speed does he have to average for the remainder of the drive to get there in exactly 1 hour 30 minutes?
assistant
How many miles does Jason drive in the first 30 minutes? ** Jason drives 60 miles per hour * 0.5 hours = <<60*0.5=30>>30 miles initially
How many miles does Jason need to drive? ** He needs to drive an additional 120 miles total - 30 miles driven = <<120-30=90>>90 more miles
How many minutes does Jason have left to drive? ** He has 1.5 hours - 0.5 hours = <<1.5-0.5=1>>1 hour to drive the remaining distance
How fast does Jason have to average? ** He must average 90 miles per hour to drive the remaining 90 miles in 1 hour
#### 90