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A boat can travel 35km upstream in 7hours. The speed of the stream is 20kmph. Find the time taken by boat to travel 20km upstream and 45km downstream.1. 6 hours2. 3 hours3. 2 hours4. 7 hours5. 5 hours |
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Answer» Correct Answer - Option 5 : 5 hours Given: ⇒ Speed upstream = 35/7 = 5kmph ⇒ Speed of stream = 20kmph ⇒ Speed of boat in still water = 20 + 5 = 25 kmph ⇒ Speed downstream = 25 + 20 = 45 kmph ∴ Required time = 45/45 + 20/5 = 5 hours |
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