No, he specified that the water is at boiling temperature when added, therefore it requires no heat to reach boiling. Effectively the amount of heat needed is just what it takes to heat the peas. Of course this is all simplified, since in fact there will be a loss of heat from the hot water. A thorough treatment would need detailed calculations of heat loss through evaporation, convection and radiation, calculations that cannot be made from the information available. But I don't think the OP intended that.