The speed of a motor -boat is that of the current of water as 36 : 5. The boat goes along with the current in 5 hours 10 minutes. It wil come back in ? मोटर-नाव और धारा की चाल का अनुपात 36 : 5 है . नाव धारा की दिशा में जाने में 5 घंटे और 10 मिनट लेती है तो वापस आने में वह कितन समय लेगी ?

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