Question

A can do a piece of work in 6 days and B in 9 days. How many days will both take
together to complete the work?
(A) 7.5 days (B) 5.4 days
(C) 3.6 days (D) 3 days​

Answer 1

Answer:3.6 days

Step-by-step explanation:According to question. A can finish the whole work in 6 days.

∴ A’s one day’s work =\frac{1}{6}

Similiarly, B’s one day’s work =\frac{1}{9}

(A+B)’s one day’s work = \left ( \frac{1}{6}+\frac{1}{9} \right )=\left ( \frac{3+2}{18} \right )=\frac{5}{18}

Therefore, (A+B) can finish the whole work in \frac{18}{5} days i.e. 3.6 days.

Hence option [C] is the right answer.