Aptitude Boats and Streams Test Paper 311) The velocity of a boat in still water is 9 km/hr, and the speed of the stream is 2.5 km/hr. How much time will the boat take to go 9.1 km against the stream?
Answer: C Answer with the Explanation: ATQ, Speed of boat in still water (S_{b}) = 9km/hr Speed of stream (S_{c}) = 2.5km/hr Distance against the stream = 9.1 km Note: against the steam = upstream Now, apply the formula: The speed of boat upstream = speed of boat  the speed of the stream The speed of upstream = 92.5 = 6.5km/hr Now, time= Distance/speed Time = 9.1/6.5, or 7/5 Or, time = 1[2/5] Or, 1hr + (2/5)*60 = 1hr + 24minutes 12) A man covers a distance of 36 km in 6 hours downstream and a distance of 40 km upstream in 8 hours. What is his speed in still water?
Answer: A Answer with the Explanation: Upstream speed = distance covered in upstream/ time Upstream speed = 40/8 = 5kmph Or, the speed of man = [½][6+5] =5.5kmph 13) A boat travels upstream from Q to P and downstream from P to Q in 3 hours. If the distance between P to Q is 4km and the speed of the stream is 1kmph, then what is the velocity of the boat in still water?
Answer: A Answer with the Explanation: Let the velocity or speed of the boat in still water is x km/hr. Note: time = Distance / Speed So, [4/ (x+1)] + [4/ (x1)] = 3 hrs. Note: go through the given options to get the answer quickly or solve the equation as follows: Or, [4 (x+1+x1)]/ [(x+1) (x1)] = 3 14) The speed of the stream is 5km/hr. A boat goes 10 km upstream and returns back to the starting point in 50 minutes. Find the velocity of the boat in still water.
Answer: B Answer with the Explanation: Let the speed or velocity of the boat in still water is x km/hr Note: Time = Distance / Speed So, [10/ (x+5)] + [10/ (x5)] = (50/60) hrs. Note: go through the given options to get the answer quickly or solve the equation as follows: Or, [10 (x5+x+5)]/ [(x+5) (x5)] = 5/6 15) A boat travels from A to B along the stream and from B to A against the stream in 3 hours. If the velocity of the boat in still water is 4 km/hr, what is the distance between A and B?
Answer: D Answer with the Explanation: Let the distance between A and B is x km Apply the formula: Time = distance/speed Let the speed of stream = y So, (x/(4+y))+ (x/(4y)) = 3hr. Aptitude Boats and Streams Test Paper 1 Aptitude Boats and Streams Test Paper 2 Aptitude Boats and Streams Test Paper 4 Boats and Streams Concepts
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