How much total heat transfer is necessary to lower the temperature of $0\mathrm{.}155kg$ of steam from $133\mathrm{.}5C$ to $-19\mathrm{.}5C,$ including the energy for phase changes?

total heat transfer

How much time is required for each stage of this process, assuming a constant $915\mathrm{.}0$ W rate of heat exchange? Give the times in the order that the stages occur

t$1=$

$t_2=$

$t_3=$

$t_4=$