Q 2 - A and B can do a bit of work in 12 days. B and C can do it in 15 days and C and A can do it in 20 days. An alone can take every necessary step in:
A - 42/3 days
B - 24 days
C - 30 days
D - 40 days
NO SPAM
CLASS 8 IIT CONCEPT
CORRECT ANSWERER GETS 5 THANKS
Answers
Step-by-step explanation:
Time taken by A and B to finish the work = 12 days.
Time taken by B and C to finish the work = 15 days.
Time taken by C and A to finish the work = 20 days.
(A+B)'s 1 day's work = 1/12.
(B+C)'s 1 day's work = 1/15.
(C+A)'s 1 day's work = 1/20.
Time taken by (A+B+C) together in 1 day = (1/12 + 1/15 + 1/20) = 5+4+3/60 = 12 / 60= 1/5.
(A+B+C)'s 1 day work = 1/10.
Work done by A in 1 day = (1/10 - 1/15) = 3-2/30 = 1/30
Hence, work done by A to finish the work in 30 days.
Answer:
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