Problem a runner is planning for a 10km race she can, Ask an Expert

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Problem: A runner is planning for a 10km race. She can maintain a steady pace of 4.10m/s for as much time as needed before ending the race with a 7.80m/s sprint.

Part A: If she wants to finish in 40 min or less, how far from the finish should she begin to sprint?

I need help to find how far from the finish should she begin to sprint.

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