Question 39220
Rate ....
Sam: (1/5)
Sue: (1/10)
Jack: (1/15)
Time ....
t
R * T = Work
(t/5) + (t/10) + (t/15) = 1
3t + 1.5t + t = 15
5.5t = 15
t = (15/5.5) = (150/55) = 30/11 = about 2 min. and 44 sec.