Harry the hungry hippo is munching on the lily pads in his pond. when he arrived at the pond, there were 22 lily pads, but he is eating 3 lily pads an hour. heinrick the hungrier hippo found a better pond with 42 lily pads! he eats 9 lily pads every hour.
a.) if harry and heinrick start eating at the same time, when will their ponds have the same number of lily pads remaining?
b.) how many lily pads will be left in each pond at that time?