A and B can finish a piece of work in 20 days, B and C can finish it in 15 days, C and A in 10 days. Time taken by them together to do this work is?
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5 day time taken together to do this work this is correct answer please choose me for brainliest answer
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A + B do (1/20)th of the work in 1 day.
B + C do (1/10)th of the work in 1 day.
C + A do (1/12)th of the work in 1 day.
2A + 2B + 2C do (1/20)+(1/10)+(1/12) = (12+24+20)/240 = (56/240)th of the work in 1 day.
A+B+C do (28/240)th of the work in 1 day.
So, A, B and C will do the same work in 240/28 = 60/7 = 8 and 4/7 days.
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