- 1. A man can row downstream at the rate of 12 Km/hr and upstream at 6 Km/hr. Find man's rate in still water and the rate of current?
A.9,6
B.6,3
C.9,3
D.6,6
Answer & Explanation
Answer: Option C 
Rate of still water = 1/2 (12 + 6) = 9 Km/hr
Rate of current = 1/2 (12-6) = 3 Km/hr
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- 2. A man can row 14 Kmph in still water. It takes him twice as long to row up as to row down the river. Find the rate of stream?
A.17.6 Km/hr
B.18.6 Km/hr
C.19.6 Km/hr
D.18.6 m/hr
Answer & Explanation
Answer: Option B
Let man's rate upstream be x kmph
Then his rate downstream = 2x kmph
Rate in still water = 1/2 (2x + x)
3x/2= 14 Kmph
3x = 28
x = 9.3
Rate of upstream = 9.3 Km/hr
Rate of downstream =18.6 Km/hr
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- 3. A man rows down stream 40 km and upstream 21 km taking 4 hrs each time. what is the velocity of current?
A.2.735 Kmph
B.2.375 kmph
C.2. 573 kmph
D.2 kmph
Answer & Explanation
Answer: Option B
Man's rate downstream = 40/4 = 10 Kmph
Man's rate upstream = 21/4 = 5.25 Kmph
Velocity of current = 1/2( 10 - 5.25)
= 2.375 Kmph
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- 4. A man can row 12 Kmph in stil water and the river is running at 4 Kmph. If the man takes 2 hour to row to a place and back how far is the place?
A.3 Km
B.2.66 Km
C.10.66 Km
D.9 Km
Answer & Explanation
Answer: Option C
Man's rate down stream = 12 + 4 = 16 kmph
Man's rate upstream = 12 - 4 = 8 kmph
Let the required distence be x Km
then, x/16 +x/8 = 2
3x = 32
x = 10.66 Km.
View Answer
- 5. A man can row downstream at the rate of 32 Kmph and upstream at 8 Kmph. Find the man’s rate in still water and rate of current?
A.20 Kmph, 10 Kmph
B.12 Kmph, 22 Kmph
C.22 Kmph, 12 Kmph
D.20 Kmph, 12 Kmph
Answer & Explanation
Answer: Option D
Rate of still water = 1/2 (down stream + upstream)
= 1/2 (32 + 8) = 20 Kmph
Rate of current = 1/2 (down stream - upstream)
= 1/2 (32 - 8)
= 1/2 (24)
= 12 kmph
View Answer
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