A,B and C can do a job in 12 hours , 20 hours and 30 hours respectively. If they all work together, how ng will they take to complete the job?
Answers
Answered by
61
A = 12hr
B = 20hr
C = 30hr
In one hr each one take to complete the work ,
A = 1 / 12
B = 1 / 20
C = 1 / 30
They work together to complete the work ,
A + B + C
= 1 / 12 + 1 / 20 + 1 / 30
= LCM = 60
= 5 / 60 + 3 / 60 + 2 / 60
= 10 / 60
= 1 / 6
= 6 hrs .
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Answered by
0
Answer:
12 hours and 20 hours and 30 12+20+30= 62
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