Question

A and B working together, can do a piece of work in 4 1/2 hours. B and C working together can do it in 3 hours. Cand A working together can do it in 2 1/4 hours. All of them begin the work at the same time. Find how much time they will take to finish the piece of work?

Answer 1

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Answer 2

Answer:

Explanation:

Lcm of 9/2,3/1,9/4 is 9

Efficiency of A+B= 9/9/2=2

Efficiency of B+C = 9/3=3

Efficiency of A+C = 9/9/4=4

2(A+B+c)=9

A+B+C =9/2 total time for A+B+C to complete

9/9/2= 9*2/9= 2hours