Question : A boatman rows 15 km in 15 minutes, along the stream and 10 km in 1 hour against the stream. Find the speed of the boat in still water.
Option 1: 33 km/hr
Option 2: 35 km/hr
Option 3: 26 km/hr
Option 4: 40 km/hr
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Correct Answer: 35 km/hr
Solution : Given: The boatman rows 15 km in 15 minutes along the stream. Downstream speed = $\frac{15}{15}\times60$ = 60 km/hr Again, the boatman rows 10 km in 1 hour against the stream. Upstream speed = $\frac{10}{1}$ = 10 km/hr We know that, Speed of the boat in still water = $\frac{1}{2} (60 + 10)$ = 35 km/hr Hence, the correct answer is 35 km/hr.
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Question : Find the speed of a boat in still water if the boat goes 12 km/hr along the stream and 4 km/hr against the stream.
Question : The speed of a boat in still water is 44 km/hr and the speed of a stream is 26 km/hr. Find the upstream speed of the boat.
Question : The speed of a boat in still water is 17 km/hr and the speed of a stream is 11 km/hr. Find the difference between the upstream speed and the downstream speed of the boat.
Question : A boat can travel at a speed of 15 km/hr in still water. If the speed of the stream is 5 km/hr, find the time taken by the boat to go 80 km downstream.
Question : A boat can travel 5 km upstream in 15 minutes. If the ratio of the speed of the boat in still water to the speed of the stream is 6 : 1, then how much time will the boat take to cover 19.6 km downstream?
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