A machine can complete a job in 6 hours. One day, there was a power failure after 4 hours. find the amount of remaining job.
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1
Answer:
2 hours will remain for job
Answered by
1
Answer:
Machine A takes 6 hours/job, so that's 1/6 jobs/hour.
Machine B takes 4 hours/job, so that's 1/4 jobs/hour.
Now you can add those up, 1/6 + 1/4 jobs/hour working together.
= 5/12 jobs/hour.
Invert that, and you get 12/5 hours/job together, or 2.4 hours.
It looks right, it's less than 4, but more than half of 4. If both machines took 4 hours/job, it's obvious that together it would be half, or 2 hours, but machine B takes 6, so it's gonna be more than 2.
2.4 hours is it.
Step-by-step explanation:
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