Question

A and B together can do a piece of work in 6 days. A alone can doit in 10 days. What time will B require to do it alone ?

• A. 20 days
• B. 15 days
• C. 25 days
• D. 30 days

Answer 1

Answer: (B)

15 days

Answer 2

The time required by B alone to finish the work = $\frac{1}{6} - \frac{1}{10}$

Take the LCM of 6 and 10

= $\frac{5-3}{30}$ = $\frac{2}{30}$

= $\frac{1}{15}$

= 15 days

The correct option is (B): 15 days