working at constant rate , pump x pumped out half of the water in a flooded basement in 6 hours . the pump y was started and the two pumps , working independently at their respective constant rates , pumped out rest of the water in 3 hours . how many hours would it have taken pump y , operating alone at its own constant rate , to pump out all of the water that was pumped out of the basement ?
"rate of x = 1 / 8 rate of x + y = 1 / 6 rate of y = 1 / 6 - 1 / 8 = 1 / 24 28 hours d"
add(add(add(add(add(add(add(add(add(add(add(add(const_1, add(3, 6)), const_1), const_1), const_1), const_1), 6), const_1), const_1), const_1), const_1), const_1), const_1)