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2014-05-29T18:55:27+03:00
100 m... 6s
30000 m(30 km).....x s
x= 30000*6/100=1800 s=30 minute
2 5 2
2014-05-29T18:55:53+03:00
100km............6s
30 km ...........xs
100/30=6/x => x = 30x6/100 = 1,8 s