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The speed of a boat in still water is 8 km / h and the speed of a stream is 1.5 km / h. A man rows to a place at a distance of 61.75 km and comes back to the starting point. What is the total time taken by him?1. 15 h2. 20 h3. 16 h4. 10 h5. 28 h |
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Answer» Correct Answer - Option 3 : 16 h Given: Speed of stream = 1.5 km / h Speed of a boat in still water = 8 km / h Distance = 61.75 km Calculations: ⇒ Rate Upstream = 8 - 1.5 = 6.5 km / h ⇒ Rate Downstream = 8 + 1.5 = 9.5 km / h ⇒ Time take to go upstream = 61.75 / 6.5 = 9.5 h ⇒ Time take to go downstream = 61.75 / 9.5 = 6.5 h ⇒ Total time = 9.5 + 6.5 = 16 h Total time taken by the man is 16 hours. |
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