Mathematics · Speed, Time and Distance
एक व्यक्ति को धारा के अनुकूल 66 किमी तैरने में 6 घंटे लगते हैं। वह उतने ही समय में धारा के प्रतिकूल 42 किमी तैरता है। शांत जल में नाव की चाल (किमी/घंटा में) क्या है?
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