Manipal Entrance Test 2016 English Paper

Time taken to complete the work by B=12 days
since, A work twice as fast as B.
∴ Time taken to complete the work by A=6 days
Now, one day work of B=

1

12

and one day work of A=

1

6

∴ One day work of (A+B)=

1

6

+

1

12

=

1

4

Hence, time taken by A and B together to finish the work = 4 days.