Mother, daughter and son can do a work in 3, 4 and 5 days respectively. How many days will they take to complete the work, if they work together?
Answer & explanation
Correct answer: option 3
Time taken by all three together to complete the work
= \(\frac{60}{20 + 15 + 12 }\)
= \(\frac{60}{47 }\)
= 1\(\frac{13}{47 }\) days