Lewis can run a 40-yard dash in 4.8 seconds. On average, how many feet does he run per second?
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The height of the fence is irrelevant. The bottom of the ladder is 3+8 = 11 feet from the building. The window is 14ft above the ground:
sqrt(14^2+11^2) = length of your ladder.
sqrt(14^2+11^2) = length of your ladder.