Question

a cyclist rides 27 miles in 1.5 hours. which is the best estimate of her speed? 18 mph 17 mph 19 mph 20 mph

Explanation:

Step1: Recall speed formula

Speed is calculated as distance divided by time, so \( \text{Speed} = \frac{\text{Distance}}{\text{Time}} \).

Step2: Substitute values

Here, distance is 27 miles and time is 1.5 hours. So, \( \text{Speed} = \frac{27}{1.5} \).

Step3: Perform division

\( \frac{27}{1.5} = 18 \) (since \( 1.5\times18 = 27 \)).

Answer:

18 mph