Olivia started her 5 mile jog at 7:40 in the morning and returned home at 8:10. Her average running speed was

Question

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Answer 1

Speed, or rate, has units of (distance)/(time).  In this problem, you could measure this in miles/hour.

 

So,  distance = 5 miles

      time =  8:10 - 7:40 = 30 minutes = (1/2 hour)

 

Speed = (5 minutes) / (1/2 hour)

          = 5 / (1/2)      miles/hour

          = 10 miles/hour                  [to divide by fraction, invert and multiply]