Question

Karna can do a piece of work in 6 hours; Dorbi and Sonal together can do it in 2 hours, while Karna and Sonal together can do it in 3 hours. How long will Dorbi alone take to do it?

Answer 1

Hi there!
Here's the answer:

•°•°•°•°•°<><><<><>><><>°•°•°•°•°•

Work done by Karna in 1 hour = 1/6

Work done by Dorbi and Sonal in 1 hr = 1/2

work done by Karna and Sonal in 1 hr = 1/3

Work done by Karna, Dorbi and Sonal in 1 hour = (1/2)+(1/3) = 5/6

Work done by Dorbi in 1 hour
= (work done by Karna, Dorbi & Sonal in 1 hr) - (work done by Karna and Sonal in 1 Hr)

= (5/6)–(1/3) = 1/2

•°• Dorbi alone can complete the work in 2 hours

•°•°•°•°•°<><><<><>><><>°•°•°•°•°•

¢#£€®$

:)

Hope it helps