sanjeev can do a piece of work in 15 hours while rahim can do it in 12 hours. How long will both take to do it , working together?
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Work done by sanjeev in 1 hour=1/15
Work done by rahim in 1 hour=1/12
Total time taken=1/15+1/12=27/180=3/20
Work done by rahim in 1 hour=1/12
Total time taken=1/15+1/12=27/180=3/20
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