URGENT !!! Please do not copy from another similar question this one is different just a little. Thank you :)

1) A square isothermal chip is of width w = 5 mm on a side and is mounted in a substrate such that its side and back surfaces are well insulated, while the front surface is exposed to the flow of a coolant at T = 15 C. From reliability considerations, the chip temperature must not exceed T=85 C. If the coolant is air with a velocity of 15 m/s. What is the maximum allowable chip power? . Air T., h W CHIP