If the Alexanders completed the 735 mi. trip in 15 hr., what was their average rate of travel?
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So we know that there are 12 inches in a foot. With this information we can do this:
But if you look you can see that the fraction is not simplified. How can we simplify it? Well, what is the Greatest Common Factor of 9 and 12? Well, the answer is 3! So divide 9 and 12 by three! SO the answer would be: 
I hope this helps!