Question

One man can do the work in 3 hours; another one can do the same work in2 hours .
how long will they take if they work together.

Answer 1

1st man 1-hour work = 1/3

   2nd man 1-hour work = 1/2

    If they work together then it will be = 1/3 + 1/2

                                                               = 1/6.

So, both will finish work in 6 hrs.