Boats & Streams

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.