Bunnybear3384
31.12.2019 •
Mathematics
Asportsman can run 320 feet down a sand dune in 20 seconds. he can run 240 feet up the sand dune in 60 seconds.
how fast can the sportsman run in the sand on level ground?
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Ответ:
320 /20 = 16' per second
240/ 60 = 4' per second
Let his speed on level ground be x ' per second
Let force of gravity be g ' per second
DOWN the sand dune = x + g = 16
UP = x - g = 4
ADD
2x = 20
x = 10
ANSWER 10' per second.
(all credit goes to ranjankar at yahoo answer)
Ответ: