Aptitude Boats and Streams Test Paper 316) A man can row, 5km/hr in still water and the velocity of the stream is 1.5 km/hr. He takes an hour when he travels upstream to a place and returns back to the starting point. How far is the place from the starting point?
Answer: B Answer with the Explanation: Let the speed of man in still water (Sb) =5km/hr Time taken to upstream and downstream is 1hr. Apply the formula: Time = distance/speed Let the distance = x km Now, (x/ downstream speed) + (x/ upstream speed) = time 17) A boatman can row a certain distance down the stream in 2 hours and can row the same distance up the stream in 3 hours. If the velocity of the stream is 4km/hr, what is the speed of the boat in still water?
Answer: D Answer with the Explanation: Let the distance = x km Now, apply the formula. Speed of stream = (1/2) [speed of downstream  speed of upstream]
Or, 4 = (1/2) [x/2  x/3] Now, speed of downstream = 48/2 = 24 km/hr Now, apply the formula. Speed of boat in still water = (½) [24+16] = 20km/hr 18) A man can row 9[1/3] km/hr in still water. He finds that it takes thrice as much time to row upstream as to row downstream (same distance). Find the speed of the current.
Answer: C Answer with the Explanation: The speed of man in still water is 9[1/3] Now, apply the formula. Speed of man in still water = (1/2) [speed of downstream + speed of upstream] Or, 9[1/3] = (1/2) [3k+ k] Now, apply the formula. Speed of current = (1/2) [downstream speed  upstream speed] 19) A boat covers 6 km upstream and returns back to the starting point in 2 hours. If the flow of the stream is 4 km/hr, what is the speed of the boat in still water?
Answer: D Answer with the Explanation: ATQ, distance covered in upstream = 6 km, and the same distance is covered in downstream Now, apply the formula Time = Distance/ speed Let the upstream speed = y km/hr, and the downstream speed = x km/hr. 6/ (S_{b} + 4) + 6/ (S_{b}  4) = 2 Since, the speed can't be ve Hence, Speed of boat in still water is 8 km/hr. 20) A boat covers 12 km upstream and 18km downstream in 3 hours while it covers 36km upstream and 24 km downstream in 6[1/2] hours, what is the velocity of the stream?
Answer: D Answer with the Explanation: ATQ, Distance in upstream =12km Now, apply the formula. Time = Distance/ speed Now, multiply equation i by 3 to equate both equations. (54/x) + (36/y) = 9............ (iii) Now subtract equation iii by iv. 30/x = 913/2 Now, put the value of x in equation i (18/12) + (12/y) = 3 Now, velocity of stream = (xy)/ 2 Aptitude Boats and Streams Test Paper 1 Aptitude Boats and Streams Test Paper 2 Aptitude Boats and Streams Test Paper 3 Boats and Streams Concepts
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