X can complete a work in 2 days and Y in 4 days.
How long will it take them to finish the work if they work together?
Show answer & explanation
Correct answer: B
Explanation
X = 2 days, Y = 4 days
X = 1/2, Y = 1/4
Total work rate = 1/2 + 1/4 = 3/4
Time = 1 ÷ (3/4) = 4/3 days