First, convert 20mph to ft/sec.
(20 * 5280) ÷ 3600 = 28.9333... ft/sec
To find out how long it would take to travel 500 ft, divide 500 by 28.9333.. and you get 17.28 seconds
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8.68 seconds
how many secounds would it take to travel 15 feet at 3.5 feet per secounds
3.72 seconds.
10.49 seconds.
15 feet ÷ 3.5 ft/s = 4.29 s.