Boats & Streams Model Questions Set 1 Section-Wise Topic Notes With Detailed Explanation And Example Questions
MOST IMPORTANT quantitative aptitude - 1 EXERCISES
The following question based on Boats & Streams topic of quantitative aptitude
(a) 6 hours 30 min
(b) 5 hours
(c) 6 hours 15 min
(d) 6 hours 50 min
The correct answers to the above question in:
Answer: (d)
Let speed of boat = 36x km/h
Speed of current = 5x km/h
∴ $(36x + 5x) × 310/60=(36x-5x) × t$
$t={41×310}/{60×31}=41/6$= 6H 50 min
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Question : 1
The speed of a boat in still water is 8 km/hr. It can travel 20 km downstream at the same time as it can travel 12 km upstream, the rate of stream (in kmph) is
a) 2.5
b) 0.5
c) 2
d) 2.75
Answer »Answer: (c)
Let rate of stream = x kmph
∴ $20/{8+x}=12/{8-x}$
160 – 20x = 96 + 12x
64 = 32x
x = 2
∴ Rate of stream = 2 kmph
Question : 2
A man takes twice as long to row a distance against the stream as to row the same distance in favour of the stream. The ratio of the speed of the boat (in still water) and the stream is
a) 2 : 1
b) 3 : 1
c) 4 : 3
d) 3 : 2
Answer »Answer: (b)
Let speed in downstream = (x + y)
Speed in upstream = (x – y)
∴ (x + y) = 2 (x – y)
x = 3y
x : y = 3 : 1
Question : 3
If a man’s rate with the current is 12 km/hr. and the rate of the current is 1.5 km/hr, then man’s rate against the current is –
a) 5.25 km/hr
b) 9 km/hr
c) 6.75 km/hr
d) 7.5 km/hr
Answer »Answer: (b)
Let the rate against the current be x km/hr. Then,
${12-x}/2$ = 1.5 ⇒12 – x = 3 ⇒ x = 9 km / hr
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