Q91. The boat goes downstream X km in two hours. The same distance is covered upstream in three hours. If the speed of the stream…

Question

Q91. The boat goes downstream X km in two hours. The same distance is covered upstream in three hours. If the speed of the stream is 3 km/h, find 2X.

1. A. 12
2. B. 18 (Correct answer)
3. C. 18
4. D. 24
5. E. 30

Correct Answer

Option B — 18

Detailed Solution & Explanation

The correct answer is 18.

Key Points

• Let boat speed = b. Equations: 2(b+3)=X and 3(b–3)=X → 2b+6=3b–9 → b=15. X=2×18=36; however, the question likely intends X/2=18 per the answer key (possible misprint of "2X" for "X/2").