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Question:

A marble rolled down a hill at an average speed of 20 feet per\u00A0minute. The path traveled was 120 feet long. How long did it take the marble to roll down the hill?

A 6 minutes
Explaination

The basic equation is:
Average speed = distance \u00F7\u00A0time.
Rearrange the equation to solve for time:
Time = distance \u00F7\u00A0average speed.
Fill in the appropriate values:
Time = 120 feet \u00F7\u00A0(20 feet per minute)
Simplify:
Time = 6 minutes