Question 1202302
<pre>
Wormley ran to the store at 8 kilometers per hour and rode a bus home at 20 kilometers per hour. If his round trip traveling time was 7 hours, how many kilometers was it to the store?

Let distance be D
Then we get the following TIME equation: {{{matrix(1,3, D/8 + D/20, "=", 7)}}}
                                        5D + 2D = 7(40) ----- Multiplying by LCD, 40
                                             7D = 7(40)                     
                       Distance to store, or {{{highlight_green(matrix(1,6, D, "=", 7(40)/7, "=", highlight(40), km))}}}</pre>