Question

A ek kaam ko 10 din mei poora krta B usi kaam ko 15 mei poora krta hai to A aur B milke us kaam ko kitne din poora ker denge.

Answer 1

One day's work of A = 1/10
One day's work of B = 1/15
One day's work of both A and B = 1/10 + 1/15
                                               = 5/30
                                               = 1/6
Total no. of days taken to complete the work = 1/1/6
                                                                 = 6 days