Mathematics · Mensuration
एक बेलनाकार मोमबत्ती (त्रिज्या 3 सेमी, ऊंचाई 10 सेमी) समान रूप से जलती है और हर 2 घंटे में ऊंचाई में 1 सेमी कम हो जाती है। कितने घंटों में मोमबत्ती का 70% आयतन जल जाएगा?
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