CUET · MATHS · PYQ PAPER 2025
A boat covers a distance of 51 km downstream in 3 hours and takes \(7 \frac{2}{7}\) hours to cover the same distance upstream. If the boat's speed in still water is \(12\) km / hrs, then the speed of the stream is:
- A 3 km/hr
- B 5 km/hr
- C 7 km/hr
- D 11 km/hr
Answer & Solution
Correct Answer
(B) 5 km/hr
Step-by-step Solution
Detailed explanation
\(V_{down} = \frac{51}{3} = 17 \text{ km/hr}\) \(V_{up} = \frac{51}{7 \frac{2}{7}} = \frac{51}{\frac{51}{7}} = 7 \text{ km/hr}\) \(S = V_{down} - B = 17 - 12 = 5 \text{ km/hr}\)
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