3. The photograph shows a recyclable box designed for transporting cold food. layered cardboard lid >layered cardboard walls The box has these design features thick walls made from several layers of cardboard with air trapped between the layers a thick lid made from layers of cardboard .Cold food and ice packs are placed in the box. (a) Give a reason why there is a net transfer of energy from the outside of the box to the inside of the box during transportation in a hot country. (1) (b) Explain how the box is designed to reduce energy transfer by convection. (2) (c) A student suggests that painting the inner surfaces of the box a different colour would help to reduce the rate of energy transfer to the cold food. Explain which colour the inner surfaces of the box should be painted. (2)