This Article consist of most important ” Boats and Streams Questions and Answers ” topic that are mostly asked in all competitive exams. We collected these questions from the students who appeared in exams. Now try to solve these questions.
Boats and Streams Questions and Answers
Question : 1 A man rows 750 m in 675 seconds against the stream and returns in 7 and half minutes. His rowing speed in still water is ?
A. 4 kmph
B. 5 kmph
C. 6 kmph
D. 7 kmph
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Correct Answer : B
Explanation :
Rate upstream = (750/675) = 10/9 m/sec
Rate downstream (750/450) m/sec = 5/3 m/sec
Rate in still water = (1/2)*[(10/9) + (5/3)] m/sec.
= 25/18 m/sec
= (25/18)*(18/5) kmph
= 5 kmph
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Question : 2 The speed of a boat in still water in 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is:
A. 1.2 km
B. 1.8 km
C. 2.4 km
D. 3.6 km
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Correct Answer : D
Explanation :
Speed downstream = (15 + 3) kmph = 18 kmph.
Distance traveled = 18 x (12/60) km = 3.6 km.
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Question : 3 A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?
A. 4 km/hr
B. 6 km/hr
C. 8 km/hr
D. Data inadequate
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Correct Answer : B
Explanation :
Rate downstream = 16/2 kmph = 8 kmph.
Rate upstream = 16/4 kmph = 4 kmph.
Speed in still water = (1/2) x (8 + 4) kmph = 6 kmph.
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Question : 4 In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:
A. 3 km/hr
B. 5 km/hr
C. 8 km/hr
D. 9 km/hr
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Correct Answer : C
Explanation :
Speed in still water = (1/2) x (11 + 5) kmph = 8 kmph.
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Question : 5 A man’s speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man’s speed against the current is:
A. 8.5 km/hr
B. 9 km/hr
C. 10 km/hr
D. 12.5 km/hr
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Correct Answer : C
Explanation :
Man’s rate in still water = (15 – 2.5) km/hr = 12.5 km/hr.
Man’s rate against the current = (12.5 – 2.5) km/hr = 10 km/hr.
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Question : 6 A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
A. 2 hours
B. 3 hours
C. 4 hours
D. 5 hours
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Correct Answer : C
Explanation :
Speed downstream = (13 + 4) km/hr = 17 km/hr.
Time taken to travel 68 km downstream = 68/17 hrs = 4 hrs.
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