Bill and Amy want to ride their bikes from their neighborhood to school which is 14.4 kilometers away. It takes Amy 40 minutes to arrive at school. Bill arrives 20 minutes after Amy. How much faster (in meters/second) is Amy's average speed for the entire trip?

Question

Bill and Amy want to ride their bikes from their neighborhood to school which is 14.4 kilometers away.  It takes Amy 40 minutes to arrive at school.  Bill arrives 20 minutes after Amy.  How much faster (in meters/second) is Amy's average speed for the entire trip?

anonymous · Answer

Velocity = distance / time
Amys velocity = 14.4 / 40 = 0.36 kilometers per minute
Bills velocity = 14.4 / (40+20) = 0.24 kilometers per minute

0.36 - 0.24 = 0.12 kilometers per minute

anonymous · Answer

Thank you! That answered it!