Question : S alone can do a piece of work in 14 days. T alone can do the same work in 21 days. U alone can do the same work in 28 days. Working together, in how many days will they complete the work?
Option 1:
Option 2:
Option 3:
Option 4:
Correct Answer:
Solution :
One day's work of S =
One day's work of T =
One day's work of U =
One day's work of S + T + U =
=
=
So, the work will be completed in
Hence, the correct answer is