Question : Ajay can row his boat in still water, at a speed of 11 km/hr, If the speed of the stream is 7 km/hr, how long will it take to a distance of 54 km downstream?
Option 1: 4 hours
Option 2: 2 hours
Option 3: 2.5 hours
Option 4: 3 hours
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Correct Answer: 3 hours
Solution : Given: The speed of the boat in still water is 11 km/hr. The speed of the stream is 7 km/hr. Downstream speed of the boat = Boat's speed + Stream's speed = 11 + 7 = 18 km/hr The time to travel 54 km in downstream $=\frac{54}{18}=3$ hours Hence, the correct answer is 3 hours.
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