Dear Students,
As you all know that Time management is one of the most important tasks in all Law Entrance examinations. We all struggle to attempt as many questions as possible in the given time to have a niche over other competitors. So, keeping in mind the needs of aspirants, the BYJU'S Exam Prep team has come up with an initiative called “Important Questions with Short Tricks” focusing on Maths section related to the exam. To make the chapter easy for you all, we are providing you with all some Short Tricks to solve the questions in Quant Section. We hope you will like it. Feel free to share your feedback with us in the comment section.
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5 Most Critical Questions with Short Tricks on Boat and Stream For Law Entrance Exams
Question 1: The speed 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?
(1) 1 hr. 20 min.
(2) 1 hr. 24 min.
(3) 1 hr. 30 min.
(4) 2 hrs. 24 min.
Solution: (2)
Speed of the boat against the stream
Time taken by the boat to go 9.1 km. against the stream
Question 2: A boat travels upstream from P to Q and downstream from Q to P in 3 hours. If the speed of the boat in still water is 9 km/hr and the velocity of the stream is 3 km/hr, then what is the distance from P to Q?
(1) 14 km
(2) 8 km
(3) 12 km
(4) 6 km
Solution: (3)
Distance between P and Q
[Here, t = 3, u = 9 and v = 3]
Other Method :
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Question 3: A man can row 5 km/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 back again to the starting point. How far is the place from the starting point?
(1) 2.5 km
(2) 6.5 km
(3) 3.5 km
(4) 2.275 km
Solution: (4)
Let the distance of the place from the starting point be x km
The speed of the man along the stream = 5 + 1.5 = 6.5 km/hr and the speed of the man against the stream = 5 – 1.5 = 3.5 km/hr
Question 4: A boat travels from P to Q along the stream and from Q to P against the stream in 3 hours. If the speed of the boat in still water is 4 km/hr, then what is the distance between P and Q?
(1) 8 km
(2) 6 km
(3) 12 km
(4) Data insufficient
Solution: (4)
Let the distance from P to Q be x km. and the velocity of the stream be y km./hr.
Since equation is one and two expressions (x and y) are unknown. Hence the data is inadequate.
Question 5: A man can row 
km/hr in still water and he finds that it takes him thrice as much time to row upstream as to row downstream (same distance). The speed of the current is
Solution: (4) 
Other method :
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