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Your neighbor leaves his yard, which is 120 ft from the bus stop. He begins to walk toward you at the bus stop and then passes you. He walks at

a speed of 4 ft/s. His distance d from you after t seconds is given by d = 120 - 4t). After how many seconds is your neighbor 30 ft from you?
A.-22.5 s and -37.5 s
B. 22.5 s and 37.5 s
C. 30 s
D. 15 s and 45 s

User Wachme
by
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1 Answer

3 votes

Answer:

ANSWER B

Explanation:

d=(120-4t)

30=120-4t

4t=120-30=90

t=90/4=22.5 s

-30==120-4t

4t=120+30=150

t=150/4=37.5 s

User Deanmcpherson
by
8.5k points

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