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ashlyn.r

  • 3 years ago

Todd's friend Olivia is flying her stunt plane at an elevation of 6.3 km. From the ground, Todd sees the plane moving directly toward him from the west at a 49° angle of elevation. Three minutes later he turns and sees the plane moving away from him to the east at a 65° angle of elevation. How fast is Olivia flying in kilometers per hour?

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  1. gianarpt
    • 3 years ago
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    the answer is 415!

  2. ashlyn.r
    • 3 years ago
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    how!??!?! hahah ty !

  3. gianarpt
    • 3 years ago
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    49 = d1 over 6.3 -> d1 = 6.3 tan 49 ≈ 7.25 km

  4. gianarpt
    • 3 years ago
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    tan 65 = d2 over 6.3 -> d2 = 6.3 tan 65 ≈ 13.5 km

  5. gianarpt
    • 3 years ago
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    Speed = Distance over Time ≈ 7.25 + 13.5 over 0.05 ≈ 415 km/hr

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