Question : Find the time taken by a boat to travel 80 km with the current, if the speed of the boat in still water is 14 km/hr and the speed of the current is 6 km/hr.
Option 1: 6 hr
Option 2: 4.5 hr
Option 3: 5 hr
Option 4: 4 hr
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Correct Answer: 4 hr
Solution : Given: The speed of the boat in still water is 14 km/hr and the speed of the current is 6 km/hr. Use the formulas, The downstream speed = The speed of the boat + The speed of the stream, ⇒ The downstream speed = 14 + 6 = 20 km/hr Let the time taken be $x$ hr. ⇒ $x=\frac{80}{20}=4$ hr Hence, the correct answer is 4 hr.
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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.
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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 : 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 : A boat takes a total of 2 hours to cover 9 km downstream and return, given that the speed of the stream is 6 km/hr. What is the speed of the boat in still water?
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