people solve this problem and explain how did you do it

6. It is common practice to treat wooden telephone poles with tar-like materials to prevent damage by water and insects. These tars are cured into the wood at elevated temperatures and pressures. Consider the case of a 0.3 m diameter pole, originally at 25 C, placed in a pressurized oven. It will be removed when the tar has penetrated to a depth of 10 cm. It is known that penetration will occur when a temperature at 10 cm depth reaches 140 C. For an oven temperature of 500 C and convection heat transfer coefficient of 150 W/mK, determine the time required to treat the pole. Properties of the wooden pole:k=0.30 W/mK, and a= 1.1107 m/s. If you use any charts, you must mark on your chart how it was used. See charts at the end