A body loses heat at a rate of \(2\) W/min when it is at a temperature of \(40^{\circ}\mathrm C,\) but at a rate of \(1\) W/min when its temperature is \(30^{\circ}\mathrm C.\) The temperature of the surroundings is:
1. \(25^{\circ}\mathrm C\)
2. \(20^{\circ}\mathrm C\)
3. \(10^{\circ}\mathrm C\)
4. \(35^{\circ}\mathrm C\)