George can fill Q cans of paint in 3 minutes. If there are R cans of paint in one gallon, how many gallons can George fill in 45 minutes? Choose the most appropriate option.
A) 30R/Q.  B) 15R/Q  C) 30Q/R  D) 5Q/R  E) 15Q/R
George can fill Q cans of paint in 3 minutes.   So in 45 mins , he can fill  45/3= 
<gadget id="calculator"> 45/3</gadget>
<output>15</output>
15Q cans.   R cans= 1 gallons   =&gt; 15Q cans = 15Q/R gallons.   Hence the answer is 15Q/R.
<result>E</result>
George can fill Q cans of paint in 3 minutes. If there are R cans of paint in one gallon, how many gallons can George fill in 45 minutes?