Let's consider an egg placed into an incubator

held at a constant $T_{fs}.$

A $60$ grams egg at $20$ C is placed in an incubator

that is maintained at $38$ C $.$ The convection

coefficient is $5\frac{W}{m^{2**}}C$; the specific heat of the

egg is $3350\frac{J}{k}{g}^{**}C$; and its surface area is

$7\mathrm{.}85**{10}^{-3}{m}^2$

How long does it take to reach within $\frac{1}{4}$ degree

C of $T_{fs}(37\mathrm{.}75C)?$