if A can do work in 12 hours, B can do same work in 15 hours and C can do the same work in 20 hours. Then how much time will they take to complete the work if they are working together
if A can do work in 12 hours, B can do same work in 15 hours and C can do the same work in 20 hours. Then how much time will they take to complete the work if they are working together
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Answer:
5 hours
Step-by-step explanation:
Time taken by A = 12 hours
B = 15 hours
C = 20 hours
by lcm (lcm is 60) we know that
=> A can do 5 unit of work per hour
similarly b = 4 unit and C = 3unit per hour
So total unit of work done by three is
=> 5+4+3 = 12 unit per hous
so
time taken = total work/ work done per hour
=> 60/12 = 5 hours
Answer:
20 hours
Step-by-step explanation:
because if A can do in 12 hours and B can do in 15 and C can do in 20 so A and B will finish their work before C and C will be the last one so they will complete their work in 20hours