Question:
Sofía is driving to Texas. She travels at 70 kilometers per hour for 2 hours, and 63 kilometers per hour for 5 hours. Over the 7 hour time period what was Sofía’s average speed?
A
65 km/h
Explaination
To find the average over the entire trip, use:
Average Speed = Total Distance ÷ Total Time.
Begin by calculating the total distance traveled:
Total Distance = 2(70) + 5(63) = 140 + 315 = 455 km
While the total time 7 hours.
Substitute these values into the average speed formula to solve:
Average Speed = 455 ÷ 7 = 65 km/h.