When the water is cold Ray swims a mile in 16 minutes. When the water is warm Ray swims a mile in 2 minutes more than twice as long. How much longer does Ray take to swim 3 miles on a hot day than a cold day?
Cold water mile = 
<gadget id="calculator">16</gadget>
<output>16</output>
16 minutes.
Warm water mile = 2+2(16)=34 minutes
3 miles in cold water: 3(16)=
<gadget id="calculator">3*16</gadget>
<output>48</output>
48 minutes
3 miles in warm water: 3(34)=
<gadget id="calculator">3*34</gadget>
<output>102</output>
102 minutes.
Ray takes 102-48=
<gadget id="calculator">102-48</gadget>
<output>54</output>
54 minutes longer.

<result>54</result>