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 – speed of stream
∴ 3 = 5 – X
X = 5 – 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
∴ Required speed = 
(20 + 15) km/hr
= 
∗ 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 – speed upstream)
X = 6 km/hr
Y= 5 km/hr
∴ Required speed = 
(6 -5) km/hr
= 
∗ 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
∴ Speed in still water = 
+ 
= 
∗ 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
∴ Speed downstream = 20 + 5= 25 km/hr
Required Time = 
= 
= 3 hours
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