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Time, Speed, and Distance, Continued - 14220_210
Time, Speed, and Distance Basics Time,  speed,  and  distance  are  related  by  the  formula: distance  =  speed  x  time.  Therefore,  if  any  two  of  the  three  quantities are  known,  the  third  can  be  found.  The  units  must  be  consistent.  (The distance  scales  on  nautical  charts  use  nautical  miles  and  yards,  unless otherwise  stated  on  the  chart.  A  nautical  mile  is  equal  to  2,000  yards.) Thus,  if  speed  is  measured  in  knots  and  time  in  hours,  the  answer  is  in nautical  miles.  Similarly,  if  distance  is  measured  in  nautical  miles  and time  in  hours,  the  answer  is  in  knots.  If  distance  is  measured  in  yards and  time  in  minutes,  the  answer  is  in  yards  per  minute. Table  19  of  Bowditch  is  a  speed,  time,  and  distance  table  that  supplies one  of  the  three  values  if  the  other  two  are  known.  It  is  intended primarily  for  use  in  finding  the  distance  steamed  in  a  given  time  at  a known  speed. Solving  the Time, Speed, and  Distance Triangle The  following  formulas  may  be  used  if  the  speed  is  measured  in  knots, the  distance  in  nautical  miles,  and  the  time  in  hours  and/or  tenths  of hours  (0.1  hour  =  6  minutes). Distance  =  Speed  x  Time Speed  =  Distance  ÷  Time Time  =  Distance  ÷  Speed Example  1.  Your  ship  steams  for  a  period  of  4  l/2  hours  and  covers  a distance  of  54  nautical  miles.  What  is  your  speed? S=D S=54 S= 12 knots T 4.5 In  example  1,  time  was  given  in  hours  and  tenths.  When  time  is  given or  required  in  minutes,  the  same  formulas,  slightly  changed,  are  still used. 8-5

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