Luis and spencer are camping out. each boy decides to build his own fire. spencer brought an ax to chop up a tree limb into foot-long sections for his fuel. luis does not have an ax, so he gathers small branches and breaks them into foot-long pieces. both sources of fuel have an equal mass, and luis and spencer light their fires at the same time. whose fire will last the longest? compare the rate at which each fuel source will burn, and be sure to explain your reasoning. hint: consider the surface area of each fuel source.