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?
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?
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?
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?
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?
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 Aptitude Boats and Streams Test Paper 2 Aptitude Boats and Streams Test Paper 3 Aptitude Boats and Streams Test Paper 4 Boats and Streams Concepts
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