# Aptitude - Aptitude- Speed

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A man rows 13 km upstream in 5 hours and also 28 km downstream in 5 hours. The velpciy of the stream is ?

• a
• b
• c
• d

speed upstream = (13/5) kmph
speed downstream (28/5) kmph
Velocity of stream = (1/2)[(28/5) - (13/5)] = 1.5 kmph

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
• b
• c
• d

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

If anshul rows 15 km upstream and 21 km downstream taking 3 hours each time, then the speed of the stream is ?

• a
• b
• c
• d

Rate upstream = (15/3) kmph
Rate downstream (21/3) kmph = 7 kmph.
Speed of stream (1/2)(7 - 5)kmph = 1 kmph.

If a boat goes 7 km upstream in 42 minutes and the speed of the stream is 3 kmph, then the speed of the boat in still water is ?

• a
• b
• c
• d

Rate upstream = (7/42)*60 kmh = 10 kmph. Speed of stream = 3 kmph.
Let speed in sttil water is x km/hr
Then, speed upstream = (x —3) km/hr.
x-3 = 10 or x = 13 kmph.

A boat takes 4 hours for travelling downstream from point A to point B aild coming back to point A upstream. If the velocity of the stream is 2 kmph and the speed of the boat in still water is 4 kmph, what is the distance between A and B?

• a
• b
• c
• d