Question

calculating speed
a cross-country skier can complete a 7.5 km race in 45 min. what is the skier’s average speed?
_____ km/h

Explanation:

Step1: Convert time to hours

45 minutes is $\frac{45}{60}$ hours = $0.75$ hours.

Step2: Use speed formula

Speed $v = \frac{\text{distance } d}{\text{time } t}$. Here, $d = 7.5$ km, $t = 0.75$ h. So $v=\frac{7.5}{0.75}$.

Step3: Calculate the speed

$\frac{7.5}{0.75}=10$ km/h.

Answer:

10