P, Q & R start work together. After working 3 days P left & now remain
A. 33.33 days
B. 39.5 days
C. 33.7 days
D. 40 days
Right Answer is: A
Work done in first 3 days by P,Q & R=100%-64%=36%
Work done in 1day day by P, Q & R =36%/3=12%
Remaining work after 3 days=64%
64% work is done by Q & R in 8 days.
So, 1-day work of Q & R=8%
Efficiency ratio of Q & R =3:5
So, 1-day work of Q is=3%
1-day work of R is =5%
& 1- day work of P =12%-8%=4%
So clearly we can observe that- Q is the slower one & will take 100%/3%=33.33 days to complete whole work.