Question 1190897

Sam jogged to Larry's house at 8 miles per hour and borrowed Larry's scooter, riding back at 20 miles per hour. If the round trip took 7 hours, how far is it to Larry's house?  Write a distance equation 
<pre>A more appropriate equation to form in order to get straight to the answer is one of TIME.
Let distance to Larry's house be D
Then we get the following TIME equation: {{{matrix(1,3, D/8 + D/20, "=", 7)}}}
5D + 2D = 280 ------ Multiplying by LCD, 40
7D = 280
Distance to Larry's house, or {{{highlight_green(matrix(1,6, D, "=", 280/7, "=", 40, miles))}}}