<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?
<bot>: 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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