If the speed of a boat moving against the current is 18 km/h , what is the speed of the stream if the boat's speed downstream is 50\% greater than its - Quantitative Aptitude MCQ Competitive Exam 2026 | ExamTest.live

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If the speed of a boat moving against the current is 18 km/h, what is the speed of the stream if the boat's speed downstream is 50% greater than its speed upstream?

Solution & Step-by-step Explanation

Let the speed of the boat upstream be U and downstream be D . Given: U = 18 km/h The downstream speed is 50% greater than the upstream speed: D = U + 50% of U = 18 + (\frac{50}{100} \times 18) = 18 + 9 = 27 km/h We know that the speed of the stream (v) is calculated using the formula: v = \frac{D - U}{2} v = \frac{27 - 18}{2} = \frac{9}{2} = 4.5 km/h

Try it yourself before checking the explanation above.

If the speed of a boat moving against the current is 18 km/h, what is the speed of the stream if the boat's speed downstream is 50% greater than its speed upstream?

4.8 kmph

4.6 kmph

5.2 kmph

4.5 kmph

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