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Page Title: Time, Speed, and Distance, Continued
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Time, Speed, and Distance, Continued Distance = Speed x Time ( minutes) 60 Speed = Distance x 60 Speed Example  2.  How  many  minutes  (m)  are  required  for  a  vessel  to  steam  a distance  of  7  nautical  miles  at  a  speed  of  7.5  knots? T(m) = D x 60 S T(m) = 7 x 60 7.5 T(m) = 420 T = 56 minutes 7.5 The  following  is  an  aid  to  help  you remember  these  formulas. Simply  place  the  letters  in  a  triangle,  as shown  in  figure  8-1.  For  distance  (D), place  your  finger  over  the  D  and  you have  S  x  T.  For  speed  (S),  cover  the  S and  you  have  D  ÷  T.  For  time  (T),  cover the  T  and  you  have Figure 8-1. D  ÷  S T, S, and D triangle. 3-Minute Rule Another  way  of  solving  problems  of  distance,  speed,  and  time  is  by using  the  3-minute  rule.  The  3-minute  rule  will  help  solve  mathemat- ical  computations  without  a  nomogram  or  calculator.  The  rule  states: The  distance  traveled  in  yards  over  3  minutes  divided  by  100  equals  the speed  in  knots.  To  simplify,  just  drop  two  zeros  from  any  distance traveled  in  yard  in  any  3  minute  period. Example  1: Ship travels 1,600 yd. in 3 min. 1,600/100 = 16 (Speed is 16 knots). Example 2: Ship’s speed is 16 kn for 3 min. 16 x 100 = 1,600 yd. 8-6

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