ninja 21 November 2006 (Update):
speed max = ⌊ 1.25 × speed voyage ⌋ speed min = ⌊ 0.75 × speed voyage ⌋ speed effective = max ( min ( speed max , speed ship ) , speed min ) {\displaystyle {\begin{array}{lcl}{\text{speed}}_{\text{max}}&=&\lfloor 1.25\times {\text{speed}}_{\text{voyage}}\rfloor \\{\text{speed}}_{\text{min}}&=&\lfloor 0.75\times {\text{speed}}_{\text{voyage}}\rfloor \\{\text{speed}}_{\text{effective}}&=&{\text{max}}({\text{min}}({\text{speed}}_{\text{max}},{\text{speed}}_{\text{ship}}),{\text{speed}}_{\text{min}})\\\end{array}}}
