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2014-05-26T21:46:46+03:00
3r..............4h...............10 800l
3r..............1h...............x

x=1* 10 800/4=  2700l

3r............1h...........2700l
3r.............3h.............y

y=3*2700/1=  8100l

3r............3h............8100l
5r.............3h..............z

z=5*8100/3
z=5*2700
z=13500l