A and B takes 9 days and 16 days more for doing a piece of work respectively than the time taken by A and B together. In how many days will they finish the work together?
Answer & explanation
Correct answer: option 1
In these type of questions:
Use direct formula : (A + B)'s time = \(\sqrt {More\;time\;taken\;by\;A\;×\;More\;time\;taken\;by\;B}\)
Hence, Using direct formula,
A + B will take = \(\sqrt {9\;×\;16}\)
= 3 x 4 = 12 days to complete the work