Mathematics · Boats and Streams
एक नाव धारा के अनुकूल 40 किमी की दूरी 2 घंटे में तय करती है। धारा के प्रतिकूल वापस आते समय उसी दूरी को तय करने में नाव को 30 मिनट अधिक लगते हैं। धारा की चाल (किमी/घंटे में) ज्ञात कीजिए।
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