# math

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Start from 110 feet away, a person on a bicycle rides towards a checkpoint and then passes it. The rider is travelling at a constant rate of 30 feet per second. The distance between the bicycle and he checkpoint is given by the equation d = |110 - 30t|. At what time is the bike 40 feet away from the checkpoint?

• math -

d = 110 - 30t = 40. Solve for t.

• math -

2.3 sec and 5 sec!

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