A carpenter has a 90 cm wooden plank. <br>He divided it into 3 pieces. <br>The first piece of plank is 15 cm long and the second piece of plank is 55 cm long. <hr>The third piece of plank is <input min="0" type="number" id ="imp2pg109q6_1" class="lineinput" placeholder="?" /> cm longer than the first.