Joseph wants to go to Boston for a road trip. If he takes route A, it will take him 5 hours to arrive; but if he takes route B, it will only take him 2 hours to arrive at his destination. How much time will he save if he takes route B to Boston and back to his home?
He will spend 5 x 2 = 
<gadget id="calculator">5*2</gadget>
<output>10</output>
10 hours if he takes route A.
Meanwhile, he will spend 2 x 2 = 
<gadget id="calculator">2*2</gadget>
<output>4</output>
4 hours if he takes route B.
Therefore, Joseph can save 10 - 4 = 
<gadget id="calculator">10-4</gadget>
<output>6</output>
6 hours if he takes route B both ways.

<result>6</result>