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2014-07-18T13:28:12+03:00
1h=60min

60km...............60min
x..........................1min

x=60*1/60

x=1km
16 4 16
2014-07-18T13:41:05+03:00
60km_______60 min x km_______1 min x=60/60 x=1 km
4 5 4