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Standard XII

Physics

Finding Average Velocity

A car drives ...

Question

A car drives a distance of d miles at 30 mph and returns at 60 mph. What is its average rate for the
round trip?

45 mph

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43 mph

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40 mph

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35mph

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Solution

The correct option is B 40 mph
Time taken with speed $30$ mph is $d / 30$ and time taken with speed $60$ mph is $d / 60$
Total time taken for round trip is $d / 30 + d / 60 = d / 20$
Average speed is $\frac{2 d}{d / 20} = 40$ mph

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A car drives a distance of d miles at 30 mph and returns at 60 mph. What is its average rate for theround trip?

The correct option is B 40 mphTime taken with speed 30 mph is d/30 and time taken with speed 60 mph is d/60Total time taken for round trip is d/30+d/60=d/20Average speed is 2dd/20=40 mph

A car drives a distance of d miles at 30 mph and returns at 60 mph. What is its average rate for the
round trip?

The correct option is B 40 mph
Time taken with speed $30$ mph is $d / 30$ and time taken with speed $60$ mph is $d / 60$
Total time taken for round trip is $d / 30 + d / 60 = d / 20$
Average speed is $\frac{2 d}{d / 20} = 40$ mph