Question

Khushi can complete a work in 10 days whereas Pinky can complete the same work in 15 days. How long will it take to complete the same work, if they both work on it together?

• A. 25 days
• B. 7 days
• C. 5 days
• D. 6 days

Answer 1

The correct option is D 6 days

Khushi does the work in 10 days
Khushi’s 1 day work $=\frac{1}{10}$

Pinky does the work in 15 days
Pinky’s 1 day work $=\frac{1}{15}$

Work done by Khushi and Pinky together in one day $=\frac{1}{10}+\frac{1}{15}=\frac{1}{6}$

Hence, Pinky and Khushi will complete the work together in 6 days