Lizzy: James drives 30 mph for half an hour and then twice as long for twice the speed. How far did he drive in total?.
Me: Hmmm, let me think. I think this is the detailed solution:
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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. Final answer: 75.
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