A man is twice as fast as a woman and a woman is thrice as fast as a boy. If together, they can finish a work in 6 days, how long will a woman and a boy together take to finish the same work?
Answer & explanation
Correct answer: option 4
Man : Woman : Boy
Efficiency 6 : 3 : 1
Total efficiency = 6 + 3 + 1 = 10
Total work = efficiency x No. of days = 10 x 6 = 60
Time taken by a woman and a boy to complete this same work = \(\frac{Total\; work}{efficiency}\)
= \(\frac{60}{4}\) = 15 days