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Three spraying machines working together...

Three spraying machines working together can finish painting a house in 60 minutes. How long will it take for 5 machines of the same capacity to do the same job?

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RD SHARMA ENGLISH-DIRECT AND INVERSE VARIATIONS-All Questions
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  3. In which of the following tables x\ a n d\ y vary inversely: (i) x, ...

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  11. In a hostel of 50 girls, there are food provisions for 40 days. If ...

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  12. A car can finish a certain journey in 10 hours at the speed of 48 km/h...

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  13. 1200 soldiers in a fort had enough food for 28 days. After 4 days, ...

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  15. A group of 3 friends staying together, consume 54 kg of wheat every...

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  20. If x\ a n d\ y vary inversely as each other and (i) x=3\ when\ y=8,\...

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