Machines A,B and C can complete a certain job in 30 min., 40 min. and 1 hour respectively. How long will the job take if the machines work together?
B - 40 min
Now this is in terms of time taken to do work;
So let the total work be x
Now in 1 min the work done is
So if we combine all 3 ie.
Now in 1 min
Consider rates per minute for each machine:
These fractions are part of
Let to total production time be t