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A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the taps are opened simultaneously, then after how much time will the cistern get filled

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A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr The man's speed against the current is

The simple interest on a certain sum of money at the rate of 5 p.a. for 8 years is RS. 840. At what rate of interest the same amount of interest can be received on the same sum after 5 years

Eighteen years ago, a father was three times as old as his son. Now the father is only twice as old as his son. Then the sum of the present ages of the son and the father is