Question

why it is difficult to burn wet cloth

Answer 1

aa it is difficult to burn water therefore in wet clothes there is presence of water

Answer 2

the heat which is supplied to burn a etc cloth first is consumed to evaporate the water in cloth for which the cloth remains unburnt. then slowly the cloth reaches its ignition temperature and catches fire. thus the process of burning wet cloth is rather slow than to burn a dry cloth which catches fire very quickly.