Working together, Wayne and his son can shovel the entire driveway in three hours. If Wayne can shovel four times as fast as his son can, how many hours would it take for his son to shovel the entire driveway on his own?  Options.
A) 4  B) 6  C) 5  D) 9  E) 12
W: the time for Wyane to do the job   S: the time for his son to do the job   We have 1/W + 1/S = 1/4 and W = 4S   Then we have 1/(4*S) + 1/S = 1/4 &lt;=&gt; 5/(4*S) = 1/4 &lt;=&gt; S = 5   ANS: 5
<result>C</result>
Working together, Wayne and his son can shovel the entire driveway in three hours. If Wayne can shovel four times as fast as his son can, how many hours would it take for his son to shovel the entire driveway on his own?