Answer:
ok so first lets find the original area which is just lenth*width
10*14=140
so they increace it by 81 so
140+81=221
then we just need to find what they increases the side by we know its the same so lets just say that x so
(10+x)(14+x)=221
x=3
so the longest time is 17 since 14+3=17
Hope This Helps!!!