Question

a student and her parents traveled from their home to see her grandparents. the trip took a total of 3 hours. the table shows the distance they covered during each hour of the trip.

time	first hour	second hour	third hour
distance (km)	42	33	45

what was the average speed during their trip from their home to the grandparents home?
○ 20 km/hr
○ 40 km/hr
○ 80 km/hr
○ 120 km/hr

Explanation:

Step1: Calculate total distance

Sum up the distances for each hour. $42 + 33+45=120$ km

Step2: Calculate average speed

Use the formula $v = \frac{d}{t}$, where $d$ is total - distance and $t$ is total time. The total time $t = 3$ hours. So, $v=\frac{120}{3}=40$ km/hr

Answer:

40 km/hr