You drive 6.00 km at 50.0 km/h and then another 6.00 km at 90.0 km/h. Your average speed over the 12.0 km drive will be

Question

Quizplus · Accepted Answer

To find the average speed, we need to divide the total distance by the total time.

Total distance = 6.00 km + 6.00 km = 12.00 km

Total time = (6.00 km / 50.0 km/h) + (6.00 km / 90.0 km/h)

Total time = 0.12 h + 0.067 h = 0.187 h

Average speed = Total distance / Total time = 12.00 km / 0.187 h = 64.17 km/h

Since the average speed is less than 70.0 km/h, the answer is C.

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