Math

Two boats start out from the same dock traveling at 9 mph and 12 mph respectively. The boats travel in slightly different directions and after 20 minutes are 2 miles apart. What is the angle that is formed by the paths of the two boats? I don't know how to set this up please help and explain!

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asked by Cassie
  1. 20 min = 1/3 hour so
    boat a goes 3 miles and boat b goes 4 miles

    sides of triangle are 2, 3 and 4 miles
    use law of cosines to find angle opposite the 2 mile side.

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    posted by Damon
  2. Thank you so much!

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    posted by Cassie

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