A tap can empty a tank in one hour. A second tap can empty it in 30 min. If both the taps operate simultaneously, how much time is needed to empty the tank?
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SBI Clerk Prelims 2016
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The compound interest on a certain sum for 2 years at 20% per annum is Rs. 880. The simple interest on the same sum for double the time at half the rate percent per annum is:
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