Buckshot, 0.2 in. in diameter, is quenched in 90 F oil from an initial temperature of 400 F. The buckshot is made of lead and takes 15 s to fall from the oil surface to the bottom of the quenching...

Buckshot, 0.2 in. in diameter, is quenched in 90F oil from an initial temperature of 400F. The buckshot is made of lead and takes 15 s to fall from the oil surface to the bottom of the quenching bath. If the convective heat-transfer coefficient between the lead and oil is 40 Btu/h ft²
F, what will be the temperature of the shot as it reaches the bottom of the bath?