ANSWER IS 3.6 HOURS

Two beams of 2 inch thick fir which have been stored outside on a cold winter day (0C) are to be glued with an adhesive material normal to the axis of the wood grain. If the adhesive cures at 200C and the beams are placed in a hot press maintained at 250C how long will it take for the adhesive to cure? Neglect thermal expansion and assume the thermal diffusivity is 0.161106m2/s. (Hint: there may be a figure of use for you in Ch 12 if you choose not to find an exact solution)