# algebra. help!

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 the checkpoint is given by the equation d=|110-30t| at what times is the bike 40 feet away from the checkpoint?

a. 2.3 sec and 5 sec
b. 1.6 sec and 5 sec
c. 2.3 sec and 4.6 sec
d. 1.6 sec and 4.6 sec

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1. I choose c

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2. |110-30t| = 40
so, either

110-30t = 40
30t = 70
t = 7/3 = 2.3

or

-(110-30t) = 40
-110+30t = 40
30t = 150
t = 5

So, (A) is correct

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3. Thank you so much!

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4. Steve definitely got it right!

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5. Just did the test still correct in 2020!!!

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