SSC
Sample Paper
SSC CHSL (10+2) Sample Test Paper-25
question_answer
A and B can do a piece of work in 15 days. B and C can do the same work in 10 days and A and C can do the same work in 12 days. Time taken by A, B and C together to do the job is-
A) 9 days
B) 4 days
C) 6 days
D) 8 days
Correct Answer:
D
Solution :
Let the total work be 60. So, Efficiency of \[(A+B),\,(B+C)\]and \[(A+C)\] are 4, 6, and 5 respectively. \[\therefore \] Time taken by A, B and C together to complete the job. \[=\,\frac{60\times 2}{(4+6+5)}=\frac{120}{15}\] = 8 days.