A bag of longan weighs (7/8) kilograms, and a bag of lychees weighs (3/5) kilograms. How many kilograms does a bag of longan weigh more than a bag of lychees?
一袋龙眼重(7/8)千克，一袋荔枝重(3/5)千克，一袋龙眼比一袋荔枝重多多少千克．
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(7/8) - (3/5)</gadget>
<output>11/40 = around 0.275</output>

<result>11/40 = around 0.275</result>