Boat and Stream for RRB PO 2025, Check High Level Questions

Boat and Stream For RRB PO 2025 Exam: Boats and Streams is an important and frequently asked topic in the quantitative aptitude section of RRB PO exams. Questions from this topic revolve around calculating the speed of the boat in still water, speed of the stream, and their effective speeds while moving upstream (against the current) and downstream (with the current). In this article, we are providing the Boat and stream important question along with the preparation strategy in the article below.

Understanding Boat and Stream

Boat and current questions revolve around the motion of a boat in water, which is affected by the speed of the boat and the speed of the water stream (current). The speed of the boat depends on whether it is moving with the stream (downstream) or against it (upstream). These problems require calculating speed, distance or time under different conditions.

Key Terms

• Speed of the Boat (b): The speed of the boat in still water (without any current), typically in km/hr or m/s.
• Speed of the Stream (s): The speed of the water current, also in km/hr or m/s.
• Downstream Speed: When the boat moves in the direction of the current, the speeds add up.
  Formula: Downstream Speed = ( b + s )
• Upstream Speed: When the boat moves against the current, the current opposes the boat’s speed.
  Formula: Upstream Speed = ( b – s )
• Speed in Still Water: If downstream and upstream speeds are given, the boat’s speed in still water is:
  Formula: ( b = \frac{\text{Downstream Speed} + \text{Upstream Speed}}{2} )
• Speed of Stream: If downstream and upstream speeds are given, the stream’s speed is:
  Formula: ( s = \frac{\text{Downstream Speed} – \text{Upstream Speed}}{2} )

Important Terms

Time and Distance Relationship

The time taken to cover a certain distance is calculated using the formula:
Time = Distance / Speed

• For downstream: ( \text{Time} = \frac{\text{Distance}}{b + s} )
• For upstream: ( \text{Time} = \frac{\text{Distance}}{b – s} )]

Boat and Stream Questions

Question 1: A boat can cover 72 km upstream or 112 km downstream in 4 hours. Find the time taken by the boat to cover 161 km in still water.

A) 7 hours

B) 7 hours 30 minutes

C) 8 hours

D) 8 hours 30 minutes

E) None of these

Question 2: A boat can cover 42 km upstream and 72 km downstream in 8 hours. It can cover 56 km in still water in 4 hours. The upstream speed of the boat is what percentage less than the downstream speed of the boat if the speed of the stream is greater than 1.75 km/h?

A) 15%

B) 20%

C) 25%

D) 30%

E) 35%

Question 3: Total time taken by a boatman to travel a distance of 360 km downstream and the same distance upstream is 10 hours and 15 hours, respectively. Find the time taken by boatman to travel 480 km in still water.

A) 12 hours

B) 16 hours

C) 20 hours

D) 24 hours

E) None of these

Question 4: Upstream speed of the boat is 20% less than the downstream speed of the boat. If the boat can cover 90 km in still water in 4 hours, then find the time taken by the boat to cover 120 km upstream and 125 km downstream.

A) 9 hours 30 minutes

B) 10 hours

C) 10 hours 30 minutes

D) 11 hours

E) None of these

Question 5: A man covers 42 km downstream in 2 hours. Find the time taken by the man to cover 36 km upstream and 45 km in still water, if the ratio of the speed of man in still water to that of the speed of stream is 5: 2, respectively.

A) 7 hours

B) 6 hours

C) 5 hours

D) 8 hours

E) None of these

Boat and Stream Questions PDF

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Boat and Stream Problem-Solving Tips for RRB PO 2025 Exam

Identify direction: Determine whether the boat is going upstream or against the current, as this affects the relative speed.
Convert units: Make sure speed and distance are in consistent units (for example, km/h and km, or m/s and m). For time conversion, 1 hour = 3600 seconds, and 1 km/h = ( \frac{5}{18} ) m/s.
Use ratios for efficiency: When distances are equal, use ratios of speeds to find ratios of times, or vice versa.
Handle special cases: Some problems involve the boat stopping mid-journey, changing speeds, or traveling a partial distance with and without the current.
Practice high-level questions: RRB PO 2025 may involve complex problems with multiple variables, so practice questions involving combined upstream/downstream trips or additional constraints.

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