## Aptitude Boats and Streams Test Paper 11) 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
Let the speed of stream = X km/hr Speed of boat = 5 km/hr Speed upstream = 3km/hr
∴ 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
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
Speed downstream = = = 6 km/hr Speed downstream = = = 5 km/hr
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
Speed upstream = = = m/s Speed downstream = = = m/s
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
Speed of boat = 20 km/hr Speed of stream = 5 km/hr ∴ Speed downstream = 20 + 5= 25 km/hr Required Time = = = 3 hours |