100+ Boats and Streams Aptitude Questions and Answers Pdf - 1
Question: 1
The speed of a boat in still water is 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is
(A) 2.4 km
(B) 3.6 km
(C) 4.8 km
(D) 5.1 km
Ans: B
Speed downstream = (15 + 3) kmph = 18 kmph.
Distance travelled = $$(18 × {12} / {60})$$ km = 3.6 km.
Question: 2
Speed of a man is 19 Km/h in still water. If the rate of current is 3 Km/h, then the effective speed of the man upstream is
(A) 6 Km/hr
(B) 7 Km/hr
(C) 9 Km/hr
(D) 10 Km/hr
Ans: B
Speed of man in still water = 10 Km/hr
Speed of current = 3 Km/hr
∴ Speed of man upstream = 10 – 3 = 7 Km/hr.
Question: 3
A boatman goes 2 Km against the current of the stream in 1 h and goes 1 Km along the current in 10 min. How long will he take to go 5 Km in stationary water?
(A) 1 hour
(B) 1.5 hour
(C) 1 hour 15 minutes
(D) 40 minutes
Ans: C
Upstream speed = 2 km/hr
Downstream speed = 6 km/hr
∴ Speed in still water = $${2 + 6} / {2}$$ = 4 km/hr.
∴ Time required to go 5 km in still water = $${5} / {4}$$ hours = 1 hours 15 minutes.
Question: 4
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 km/hr
(B) 8.5 km/hr
(C) 9 km/hr
(D) 10 km/hr
Ans: D
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.
Question: 5
A man can row upstream at 7 kmph and downstream at 10 kmph. Find man’s rate in still water and the rate of current.
(A) 1.2 km/hr
(B) 1.5 km/hr
(C) 1.8 km/hr
(D) 2.1 km/hr
Ans: B
Rate in still water = $${1} / {2}$$(10 + 7) km/hr = 8.5 km/hr.
Rate of current = $${1} / {2}$$ (10 -7) km/hr = 1.5 km/hr.
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