A man working 8 hours a day takes 5 days to complete a project. How many hours a day must he work to complete it in 4 days?

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answer is A.

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Detailed Solution

Concept- Time and work share a fundamental idea in common with other arithmetic topics, namely the idea of proportionality. When the amount of work is constant, efficiency is inversely proportional to the length of time required. In other words, because RT = W, which is a fixed amount, R and T are inversely proportional.
If a man wants to reach his goals faster, he needs to improve his daily productivity, or we can say daily working hours. With these types of questions, evaluate your overall work and then follow the questions to evaluate the rest.
Given: A man works 8 hours a day takes 5 days to complete a project
Same work to be done in 4 days
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