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#
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?

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A
65 km/h

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.

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.

B 64 km/h

C 66 km/h

D 67 km/h

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