Tom can type 90 words a minute.  A page is 450 words.  How long would it take him to type out 10 pages?
He can type out 1 page in 450/90=
<gadget id="calculator">450/90</gadget>
<output>5</output>
5 minutes.
So it would take 5*10=
<gadget id="calculator">5*10</gadget>
<output>50</output>
50 minutes.

<result>50</result>