Average Speed due to Heavy Traffic
Classical Mechanics
Level
2
Your car travels 50 km from your house to the park for 40 minutes. But due to heavy traffic, a return trip took you extra 20 minutes. What is the average speed of your car during the whole trip? Express your answer in km/hr.
The answer is 60.
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1 solution
.
One way: 50 km in 40 minutes
Back way: 50 km in 60 minutes
Total: 100 km in 100 minutes, or 100/60 hours
Hence, average speed 60 km/hour