A cistern can be filled by a supply pipe in 25 mins and emptied by a waste pipe in 45 mins. If both pipes are opened together, in what time will the cistern be full?
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Cistern can he full in 1 hour
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(i) When the value of imports is more than the value of exports, it is called 'unfavorable balance of trade. (ii) When the value of exports is more than the value of imports, it is called 'favourable balance of trade.
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