Question

a horse trainer records the distance a horse travels during three different trials.
trial 1 2 3
time (minutes) 15 30 45
distance (kilometers) 4.5 9.0 13.5
what is the horses average speed in kilometers per minute?
o 0.5 km/min
o 1.8 km/min
o 0.3 km/min
o 1.6 km/min

Explanation:

Step1: Recall speed formula

Speed $s=\frac{d}{t}$, where $d$ is distance and $t$ is time.

Step2: Calculate speed for each trial

For trial 1: $s_1=\frac{4.5}{15}= 0.3$ km/min.
For trial 2: $s_2=\frac{9.0}{30}=0.3$ km/min.
For trial 3: $s_3=\frac{13.5}{45}=0.3$ km/min.

Step3: Calculate average speed

Since the speed in each trial is the same ($s_1 = s_2=s_3 = 0.3$ km/min), the average speed is also $0.3$ km/min.

Answer:

$0.3$ km/min