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Boats & Streams Quantitative Aptitude — Study Notes & MCQ Practice 2026

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Study Notes

Boat & Stream: Quick Revision

Essential formulas and shortcuts for PreLim & Mains

1 Basic Formulas

Effective Speeds

Downstream (D) = B + S

Upstream (U) = B − S

Finding Components

Boat Speed (B) = (D + U) ÷ 2

Stream Speed (S) = (D − U) ÷ 2

2 Golden Shortcuts

⭐ Shortcut: Same Distance Logic

Speed ratio is the inverse of time ratio. (Useful for Mains)

Downstream Time : Upstream Time = 2 : 3
→ Speed Ratio = 3 : 2

Student Hacks

  • Downstream speed MUST be greater.
  • Ratio Questions: Up/Down = Down Speed / Up Speed.
  • Swimmer logic = Boat logic.

Avoid Mistakes

  • ❌ Adding stream speed for Upstream.
  • ❌ Forgetting Unit Conversion (min → hr).
  • ❌ Solving Algebra when formulas work.
30-Second Revision Box
D = B + S U = B − S B = (D + U)/2 S = (D − U)/2

Remember this → Boat & Stream is done ✅

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