# Aptitude Boats and Streams Test Paper 1

1) The speed of a boat in still water is 5km/hr. If the speed of the boat against the stream is 3 km/hr, what is the speed of the stream?

- 1.5 km/hr
- 2 km/hr
- 2.5 km/hr
- 1 km/hr

The correct answer is **B**

**Answer with explanation:**

Let the speed of stream = X km/hr

Speed of boat = 5 km/hr

Speed upstream = 3km/hr

**Apply formula:** Speed upstream = speed of boat â€“ speed of stream

âˆ´ 3 = 5 â€“ X

X = 5 â€“ 3 = 2 km/hr

2) A man rows downstream at 20 km/hr and rows upstream at 15 km/hr. At what speed he can row in still water?

- 17.5 km/hr
- 18 km/hr
- 20.5 km/hr
- 22 km/hr

The correct answer is **A**

**Apply formula: Speed in still water = (speed downstream + speed upstream) **

Speed downstream = 20 km/hr

Speed upstream = 15 km/hr

âˆ´ Required speed = (20 + 15) km/hr

= âˆ— 35 = 17.5 km/hr

3) A man swims 12 km downstream and 10 km upstream. If he takes 2 hours each time, what is the speed of the stream?

- 1 km/hr
- 0.5 km/hr
- 1.5 km/hr
- 0.7 km/hr

The correct answer is **B**

**Answer with explanation:**

Speed downstream = = = 6 km/hr

Speed downstream = = = 5 km/hr

**Apply formula: Speed of stream = (speed downstream â€“ speed upstream)**

X = 6 km/hr

Y= 5 km/hr

âˆ´ Required speed = (6 -5) km/hr

= âˆ— 1= 0.5 km/hr

4) A boat covers 800 meters in 600 seconds against the stream and returns downstream in 5 minutes. What is the speed of the boat in still water?

- 1 m/s
- 1.5 m/s
- 2 m/s
- 2.5 m/s

The correct answer is **C**

**Answer with explanation:**

Speed upstream = = = m/s

Speed downstream = = = m/s

**Apply formula: Speed in still water = (speed downstream + speed upstream)**

X = m/s

Y = m/s

âˆ´ Speed in still water = +

= âˆ— 4 = 2 m/s

5) A man can row a boat at a speed of 20 km/hr in still water. If the speed of the stream is 5 km/hr, in what time he can row a distance of 75 km downstream?

- 1.5 hours
- 2 hours
- 2.5 hours
- 3 hours

The correct answer is **D**

**Answer with explanation:**

Speed of boat = 20 km/hr

Speed of stream = 5 km/hr

âˆ´ Speed downstream = 20 + 5= 25 km/hr

Required Time = = = 3 hours

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