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If a man rows at the rate of 10 km/h in still water and his rate against the current is 4 km/h. then the man's rate along the current is:1. 15 km/h2. 20 km/h3. 10 km/h4. 16 km/h5. 24 km/h |
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Answer» Correct Answer - Option 4 : 16 km/h Given: Upstream rate = 4 km/h Speed of a man in still water = 10 km/h Formula Used: Speed of the man (boat) in still water = ½ [DOWNSTREAM rate + UPSTREAM rate] Calculations: Let the downstream rate be x kmph According to the formula, Speed of the man (boat) in still water = ½ [DOWNSTREAM rate + UPSTREAM rate] ⇒ 10 = (1/2) (x + 4) ⇒ 20 = x + 4 ⇒ x = 20 – 4 ⇒ x = 16 km/h The man's rate along the current is 16 km/h. |
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