दो समान ऊंचाई वाले मोमबत्ती क्रमशः 12 एवं 20 घंटे में पूरी तरह जल जाती है स्थायी चाल से कितने समय बाद उनकी ऊंचाई का अनुपात 3:5 होगा
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Candles of the same height will burn completely in 12 and 20 hours respectively, after how long will their height ratio be 3: 5 with a permanent speed.
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