Heat And Thermodynamics

A glass of hot water cools from \(90^{\circ} \mathrm{C}\) to \(70^{\circ} \mathrm{C}\) in 3 minutes when the temperature of surroundings is \(20^{\circ} \mathrm{C}\). What is the time taken by the glass of hot water to cool from \(60^{\circ} \mathrm{C}\) to \(40^{\circ} \mathrm{C}\) if the surrounding temperature remains the same at \(20^{\circ} \mathrm{C}\) ?