Question

Set up the following application problem and don't forget to declare your variable. Round to 2 decimal points.

Answer 1

Let w equal Larry's walking speed. Then:
110/w+2=80/w-2
80w+160=110w-220
30w=380
w=12.67 ft/sec as Larry's walking speed
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Answer 2

Reminder; time = Distance/Speed
a)If his walking speed is "s" and the moving sidewalk is 2, then the speed of the whole will be s+2
b) On his way back, his speed is always s, but the moving sidewalk is (- 2), then his total speed on his way back will be s-2
Now let bring it in an equation. Note that he spent the same time in both direction (only the distance changed):

time = 110/(2+s) = 80/(s-2)
Solving it will give s = 12.666 ft/s
or s= 12.67 ft/s