A Styrofoam box used to keep drinks cold at a picnic

has a total wall area $($including the lid$)$ of $0\mathrm{.}80$ m$2$

and wall thickness $2\mathrm{.}0$ cm$.$ It is filled with ice, water

and cans of soft drinks at $0$C$.$ what is the rate of heat

flow into the box if the temperature of the outside

wall is $30$C$?$ How much ice melts in one day?