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UPSC CDS I 2019 Math Paper

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Question : 40

Total: 100

Tushar takes 6 hours to complete a piece of work, while Amar completes the same work in 10 hours. If both of them work together, then what is the time required to complete the work ?

3 hours
3 hours 15 minutes
3 hours 30 minutes
3 hours 45 minutes

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