Question:
A boat goes 30 km downstream in 2 hours and returns the same distance upstream in 3 hours. The speed of the stream is:
A boat goes 30 km downstream in 2 hours and returns the same distance upstream in 3 hours. The speed of the stream is:
Updated On: Jul 10, 2026
- 2.5 km/h
- 5 km/h
- 2 km/h
- 3 km/h
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The Correct Option is A
Solution and Explanation
Step 1: Downstream speed \(= \dfrac{30}{2} = 15\) km/h; upstream \(= \dfrac{30}{3} = 10\) km/h.
Step 2: Stream speed \(= \dfrac{15-10}{2} = 2.5\) km/h.
Step 2: Stream speed \(= \dfrac{15-10}{2} = 2.5\) km/h.
Quick Tip: Stream speed = (downstream - upstream) / 2.
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