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Clyde drove 30 miles in 20 minutes and then drove an additional 10 miles in 10 minutes. What is the average speed for the entire trip?

Question

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Clyde drove 30 miles in 20 minutes and then drove an additional 10 miles in 10 minutes. What is the average speed for the entire trip?

astrophysics · Answer

$$S_{avg} = \frac{ Total~Distance }{ Total~ time }$$

anonymous · Answer

i know that but the average I'm having trouble with

astrophysics · Answer

All you have to do is plug in the values at this point.

anonymous · Answer

you're really unhelpful

astrophysics · Answer

K, well what is the total distance?

anonymous · Answer

40

astrophysics · Answer

Good, and total time?

astrophysics · Answer

By the way, do they want your answer in miles/ minutes or what?

anonymous · Answer

miles

anonymous · Answer

30 minutes

astrophysics · Answer

Good, but speed is measured with two quantities, hence the formula distance/ time, so I assume they want it in miles/ minutes, so just divide it now.

anonymous · Answer

75 miles an hour

valpey · Answer

Total distance, as you have assessed, is 40 miles. The total time is 20 min + 10 min = 30 min. So that can be said to be 40 miles per 30 minutes. But we probably want to state speed in terms of miles per hour. If you can go 40 miles in half an hour how many miles would you go in a whole hour?