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08.11.2020 •
Mathematics
A motorboat maintained a constant speed of 16 miles per hour relative to the water in going 55 miles upstream and then retuming. The total time for the tip was 8.0 hours. Use this information to find the speed of the current.
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Ответ:
Step-by-step explanation:
Let the speed of the current be c
Time upstream is
55/(16 + c)Time downstream is
55/(16 - c)Total time is 8 hours
55/(16 + c) + 55/(16 - c) = 855(16 -c + 16 + c)/(16 + c)(16 - c) = 855*32= 8*(16² - c²)220 = 256 - c²c² = 36c = 6 mphОтвет:
Easton tiene razón ya que 210 - 152 es 58, si gastó 152 del total solamente queda restar.