Question 18
Four bricklayers individually take 3,4,5 and 6 hours to build a wall of the same size. Working together at those rates, how long do they take? AI reconstruction: their rates are constant and add without interference; answer in MINUTES, rounded to the nearest whole minute. Original options were A:1/2 hr; B:1 hr; C:1½ hr; D:2 hr; E:2½ hr. Enter the corrected number of minutes.
