Paul works for three hours. Sally works 2 1/2 times as long as Paul. Raul works 3/4 hours less than Paul. Tim works 1 1/3 times as long and Raoul. How long does each person work? How long do they work together?
p = 3
s = 3(2 1/2) = 7 1/2
r = 3 - 3/4 = 2 1/4
t = (2 1/4)(1 1/3) = 3
now just add 'em up