Sam is twice as efficient as tom and takes 120 days less than tom to complete a job. If both sam and tom worked together,how many days would they need to complete the same job?
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Answer:
80 days
Step-by-step explanation:
As Sam is twice as efficient as Tom
Ratio of times taken by Sam and Tom = 1 : 2
If difference of time is 120 days, Same takes 2*120 = 240days
Tom takes = 120 days
work done in one day = 1/240 + 1/120 = 3/240 = 1/80
Take reciprocal
so it will take 80 days to complete the job if both works.
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