In the following questions, two equations Quantity I and Quantity II are given. You have to solve both the equations and give answer. निम्नलिखित प्रश्नों में, दो समीकरणों के मात्रा I और मात्रा II दिए गए हैं। आपको दोनों समीकरणों को हल करना है और प्रश्न का उत्तर देना है। I-A man can row a distance of 4km upstream in 30 min and returns the same distance in 20 min. How much time will he take to row the same distance in downstream if due to a wind the speed of the current gets doubled? II-A 200 meter long train crosses a 600 meter long bridge in 20 seconds. What time will it take to cross a platform 480 meter long?\ I- एक आदमी 30 मिनट में 4 किमी तक की दूरी बहाव के विपरीत तय कर सकता है और उसी दूरी को 20 मिनट में बहाव के साथ तय कर सकता है। यदि एक हवा के कारण धारा की गति दोगुनी हो जाती है, तो उसे बहाव के साथ समान दूरी तय करने में कितना समय लगेगा? II- 200 मीटर लंबी ट्रेन 600 मीटर लंबे पुल को 20 सेकंड में पार करती है। 480 मीटर लंबे एक प्लेटफॉर्म को पार करने में कितना समय लगेगा?
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