Boats & Streams
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Quantitative Aptitude - Boats & Streams
Handle upstream and downstream speed problems using flow adjustments.
1. Definitions
Downstream speed = Boat speed + Stream speed; Upstream = Boat speed − Stream speed.
2. Formula
Time = Distance / Speed. Use correct speed for upstream/downstream leg.
3. Quick Tips
- Define variables for boat and stream speed early.
- Use average speed formula for round trips: \( \frac{2BD}{B^2 - S^2} \).
4. Common Errors
- Switching upstream/downstream speeds incorrectly.
5. Revision Checklist
- Practice upstream/downstream and round-trip problems.
Summary: Set basic speed variables, apply formulas carefully for upstream/downstream legs, and calculate time directly.
Topics
- Number System
- H.C.F. & L.C.M.
- Decimal Fractions
- Simplification
- Square Roots & Cube Roots
- Average
- Problems on Ages
- Percentage
- Profit & Loss
- Ratio & Proportion
- Time & Work
- Pipes & Cistern
- Time & Distance
- Problems on Trains
- Boats & Streams
- Simple Interest
- Compound Interest
- Area
- Volume & Surface Areas
- Mensuration
- Algebra
- Work & Wages
- Geometry (Lines, Angles, Triangles, Polygons)
- Data Interpretation
- Trigonometry
- Statistics (Mean, Median, Mode)