4 meters - 1.25 meters=2.75m is the length of the second one.
But when they ask how <u>much longer</u> , I think they want you to <u>compare</u> the two pieces meaning to get the answer you have to take 2.75m-1.25m=<u>1.5m</u><u> </u><u>that</u><u>s</u><u> </u><u>how</u><u> </u><u>much</u><u> </u><u>longer</u><u> </u><u>the</u><u> </u><u>2nd</u><u> </u><u>fabric</u><u> </u><u>is</u><u> </u><u>longer</u><u> </u><u>than</u><u> </u><u>the</u><u> </u><u>other</u><u> </u><u>one</u><u>.</u>