Bob roller skates 48 km in 4 hours. What is his average speed in kilometers per hour?

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Bob roller skates 48 km in 4 hours. What is his average speed in kilometers per hour?

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Answer 1 · 2017-05-21T20:50:25

His average speed is $12 km/hr$ $"12 km/hr"$ .

Explanation:

Remember the triangle of Speed, Distance and Time. If you remember it, you'll ace these kinda questions.

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I had trouble with these formulas but the triangle helped me a LOT! Anyways, let's get back to the question. The formula for average speed is pretty much the same as the formula for just speed. The average speed formula is

$Average speed = \frac{Total Distance}{Total Time}$ $"Average speed" = "Total Distance"/"Total Time"$

So......

$\frac{48 km}{4 hr} = 12 km/hr$ $"48 km"/"4 hr" = "12 km/hr"$

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Bob roller skates 48 km in 4 hours. What is his average speed in kilometers per hour?

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