human
James drives 30 mph for half an hour and then twice as long for twice the speed. How far did he drive in total?
assistant
How far did James drive in the first half hour? ** His first drive was 30*.5=<<30*.5=15>>15 miles
How long was the second half hour? ** The next leg was .5*2=<<.5*2=1>>1 hour
How fast was James driving? ** The speed of the trip was 30*2=<<30*2=60>>60 mph
How far did James drive in the second half hour? ** So he drove 60*1=<<60=60>>60 miles
How far did James drive in total? ** So in total he drove 60+15=<<60+15=75>>75 miles
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