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2014-07-05T10:25:05+03:00
90m..........30 sec
x................1/5 sec

x=90* 1/5 /30

x=90/5/30

x=18/30

x=0,6m
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2014-07-05T10:53:55+03:00
 \frac{1}{5} secunde = 0,2 secunde

90:30=3 metii parcuge in o secunda.

3m...............1 s
x m .............0,2 s
____________
x=  \frac{3x0,2}{1}
x=0,6
1 5 1