Mht Cet
Heat And Thermodynamics
MHT CET 2023 14th May Evening Shift
MCQ+1 / -02023
A metal rod cools at the rate of \(4{ }^{\circ} \mathrm{C} / \mathrm{min}\) whon its temperature is \(90^{\circ} \mathrm{C}\) and the rate of \(1{ }^{\circ} \mathrm{C} / \mathrm{m}{\text {in }}\) when its temperature is \(30^{\circ} \mathrm{C}\). The temperature of the surrounding is