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3. Rita and Neha can do certain work individually in 20 hours and 25 hours,respectively. How much time will it take,if they work together to complete thework? |
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Answer» Work DONE by RITA in 1 hour = 1/20Work done by Rita in 1 hour = 1/20Work done by Neha in 1 hour = 1/25Work done by Rita in 1 hour = 1/20Work done by Neha in 1 hour = 1/25total work done in ONE hour = 1/20+1/25Work done by Rita in 1 hour = 1/20Work done by Neha in 1 hour = 1/25total work done in one hour = 1/20+1/25 = 5+4/100 = 9/100Work done by Rita in 1 hour = 1/20Work done by Neha in 1 hour = 1/25total work done in one hour = 1/20+1/25 = 5+4/100 = 9/100full work done TOGETHER = 1÷9/100Work done by Rita in 1 hour = 1/20Work done by Neha in 1 hour = 1/25total work done in one hour = 1/20+1/25 = 5+4/100 = 9/100full work done together = 1÷9/100 = 100/9 |
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