One loom can weave (21/4) meters per hour, and the same four looms can weave (13/3) hours, how many meters can we weave?
1台织布机每小时可织布(21/4)米，同样的4台织布机织布(13/3)小时，可以织布多少米？
<gadget id="calculator">21 / 4</gadget>
<output>21/4 = around 5.25</output>

<gadget id="calculator">13 / 3</gadget>
<output>13/3 = around 4.333333</output>

<gadget id="calculator">(21/4) * 4 * (13/3)</gadget>
<output>91</output>

<result>91</result>