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Machine A’s time =1 target/10 days
Machine B’s time =1target /20 days
Both together =1/x days
Solve for x.
1/10 +1/20 =1/x
3/20=1/x
x =20/3
Both Machines will complete the target in6 days 8 hours
exect20/3 days
6.66 Days i.e 7 Days (Machine A6.66% of the task and Machine B3.33% of the task)