SOLUTION: Find out the average rate of (i) motion in the case of a person who rides the first mile at the rate of 10 miles an hour, the next mile at the rate of 8 miles per hour, and the thi

Question 1114525: Find out the average rate of (i) motion in the case of a person who rides the first mile at the rate of 10 miles an hour, the next mile at the rate of 8 miles per hour, and the third mile at the rate of 6 miles per hour; (ii) increase in population, which in the first decade has increased 20%, in the next 25% and in the third 44%.
Answer by ikleyn(52777) (Show Source): You can put this solution on YOUR website!
.

a)  The person rode 3 miles in total.


    For the 1-st mile he spent    of an hour.


    For the 2-nd mile he spent    of an hour.
    

    For the 3-rd mile he spent    of an hour.


    In all, he spent   +  +  =  =   of an hour.


    The average speed =  =  =  = 7.66 miles per hour.

Solved.

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