Problem as an airplane taxies on the runway with a speed of, Ask an Expert

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Problem: As an airplane taxies on the runway with a speed of 15.0 m/s, a flight attendant walks toward the tail of the plane with a speed of 1.42 m/s.

Part A: What is the flight attendant's speed relative to the ground?

I need help to find the flight attendant's speed relative to the ground.

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