Heyy !!!!which book you are having in your syllabus ?
U r soo intelligent
U r soo quick
Aishna you are right!!
You are so intelligent
Yes its correct answer
Is this question of RD Sharma
Plz do math on plain copy
How many chapter you have camplet
I think the answer will be 30 days. B needs 30 days to complete the work alone.
sol:-Time taken by A and B, together,to do the work=10 days. So,work completed by A and B in 1 day=1/10 part of the total work.
A completes the work alone in=15 days.So,work done by A alone in 1 day=1/15 part of the total work.
Therefore:-Work done by B alone in 1 day,if A is absent=(Total work done by both A and B in 1day)-(Work done by A alone in 1 day)
= (1/10 - 1/15)=3-2/30=1/30
=1/30 part of the total work.
So,time needed by B alone is 30 days.