Machine A takes twice as much time as machine B to make N items.
Working together at their respective rates, A and B can make 5 items
in 3 days. How many days will A take to produce 2 items
i get 3 1/3 days
A classic formuls is Work=Rate*Time
rate A = x
rate B = 2x
(x+2x)*3=5, where x=5/9
rate A = x = 5/9
T=2/rate A=2/5/9=18/5=3 and 3/5 day.