11 SSC CGL Quantitative Aptitude previous year questions on Boats and Streams — options free on every question; 1 include the answer & explanation free, the rest unlock with PYQ Pass.
Q1 FREE PREVIEW
PYQ
A boat can go 5 km upstream and 7 km downstream in 45 minutes. It can also go 5 km downstream and 2.5 km upstream in 25 minutes. How much time (in minutes) will it take to go 6 km downstream?
a10
b12
c15
d20
✓ Correct answer: b) 12
ExplanationA boat can go 5 km upstream and downstream in 45 minutes.It can also go 5 km downstream and 2.5 km upstream in 25 minutes.Speed of boat during downstream = D km/hr Speed of boat during upstream = U km/hr According to the question, …………..(1) …………..(2) Multiply by 2 both sides ………….(3) Subtract (1) from (3) Speed of boat during downstream = 30 km/hr Time required to go 6 km downstream = Hence, Option B is the correct answer.
Q2
PYQ
A man rows a boat a certain distance downstream in 9 hours, while it takes 18 hours to row the same distance upstream. How many hours will it take him to row three-fifth of the same distance in still water?
a9.5
b7.2
c10
d12
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Q3
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A motorboat whose speed is 20 km/h in still water takes 30 minutes more to go 24 km upstream than to cover the same distance downstream. If the speed of the boat in still water is increased by 2 km/h, then how much time will it take to go 39 km downstream and 30 km upstream?
a2 h 50 m
b3 h 10 m
c3 h 40 m
d2 h 40 m
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Q4
PYQ
A boat can cover a distance of 56 km downstream in 3.5 hours. The ratio of the speed of the boat in still water and the speed of the stream is 3 : 1 . How much time (in hours) will the boat take to cover a distance of 41.6 km downstream?
a2.1
b1.5
c2.6
d1.8
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Q5
PYQ
A boat moves 25km upstream and 39km downstream in 8 hours. It travels 35km upstream and 52km downstream in 11 hours. What is the speed of the stream if it travels at a uniform speed?
a4 km/h
b5 km/h
c6 km/h
d3 km/h
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Q6
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A boat covers a certain distance against the stream in 9 hours 36 min and it covers the same distance along the stream in 6 hours. What is the ratio of the speed of the boat in still water to that of the stream?
a13:3
b9:2
c11:6
d8:5
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Q7
PYQ
A boat can cover upstream and back in a total of 30 hours, and upstream and downstream in a total of 7 hours. How much distance will the boat cover in 16 hours in still water?
a200 km
b180 km
c175 km
d225 km
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Q8
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A boat running upstream takes 10 hours to cover a certain distance, while it takes 7 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and that of the water current, respectively?
a17: 5
b3: 17
c2: 17
d17: 3
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Q9
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A boat goes 20 km upstream and 44 km downstream in 8 hours. In 5 hours, it goes 15 km upstream and 22 km downstream. Determine the speed of the boat in still water.
a6 km/h
b10 km/h
c8 km/h
d7 km/h
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Q10
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A boat covers 35 km downstream in 2 h and covers the same distance upstream in 7 h . Find the speed (in km/h) of the boat in still water.
a11.25
b28.75
c18.25
d10.55
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Q11
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To go a distance of 144 km upstream, a rower takes 12 hours while it takes her only 9 hours to row the same distance downstream.What is the speed of the stream?
a3 km/h
b1 km/h
c1.5 km/h
d2 km/h
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