SOLUTION: The distance from King Street to Prince Street is 21 km. It takes 30 minutes. What is the average speed of the bus between these two places?

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Question 403876: The distance from King Street to Prince Street is 21 km. It takes 30 minutes.
What is the average speed of the bus between these two places?
Answer by texttutoring(324) About Me  (Show Source):
You can put this solution on YOUR website!
The relationship between Distance, Speed and Time is found in this formula:

D=ST

You have D at T, and you're looking for S. First, let's change T from 30 minutes to 0.5 hours, so that our speeed will be in km/h.

D=ST
21 = S(0.5)
S = 21/0.5
S = 42 km/h

So the average speed is 42 km/h.

Hope this helps!