While driving at $80 \mathrm{~km} / \mathrm{h}$, Sally's car passes a hydro pole every four seconds. Which of the following is closest to the distance between two neighbouring hydro poles?
(A) $50 \mathrm{~m}$
(B) $60 \mathrm{~m}$
(C) $70 \mathrm{~m}$
(D) $80 \mathrm{~m}$
(E) $90 \mathrm{~m}$

## Part C: Each correct answer is worth 8.
Since Sally's car travels $80 \mathrm{~km} / \mathrm{h}$, it travels $80000 \mathrm{~m}$ in one hour.

Since there are 60 minutes in an hour, the car travels $\frac{1}{60} \times 80000 \mathrm{~m}$ in one minute.

Since there are 60 seconds in a minute, the car travels $\frac{1}{60} \times \frac{1}{60} \times 80000$ in one second.

Therefore, in 4 seconds, the car travels $4 \times \frac{1}{60} \times \frac{1}{60} \times 80000 \approx 88.89 \mathrm{~m}$.

Of the possible choices, this is closest to $90 \mathrm{~m}$.

ANSWER: (E)