Mathematics · Speed, Distance and Time
एक नाव धारा के प्रतिकूल 21.6 किमी जाती है और 3.36 घंटे में उसी बिंदु पर वापस आ जाती है। धारा की चाल 4 किमी/घंटा है। नाव को धारा के अनुकूल 39.6 किमी और फिर शांत जल में 25.2 किमी की दूरी तय करने में कितना समय (घंटों में) लगेगा?
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