Q: James drives 30 mph for half an hour and then twice as long for twice the speed. How far did he drive in total?
A: 75
Explain how we arrive at this answer: 
Explanation: His first drive was 30 * .5 = 15 miles. The next leg was .5 * 2 = 1 hour. The speed of the trip was 30 * 2 = 60 mph. So he drove 60 * 1 = 60 miles. So in total he drove 60 + 15 = 75 miles.