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The speed of a boat in still water is 30 km/h and speed of stream is 6 km/h. What is the time taken by the boat in minutes to cover a distance of 12 km downstream?1. 182. 203. 254. 30 |
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Answer» Correct Answer - Option 2 : 20 Given- Speed of a boat in still water = 30 km/h Speed of stream = 6 km/h Formula Used- Distance = Speed × Time Concept Used- Relative Downstream Speed = Speed of a boat in still water + Speed of stream Calculation- Relative Downstream Speed = 30 + 6 ⇒ 36 km/hr Time taken = 12/36 hr ⇒ (1/3) × 60 minutes ⇒ 20 minutes ∴ Time taken by the boat to cover a distance of 12 km downstream is 20 minutes. |
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