aptitude - Boats and streams
Quiz by KAVIN K
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- Q1
A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
B 3 hours
D 5 hours
A 2 hours
C 4 hours
30s - Q2
A man can row 9 and ⅓ kmph in still water and finds that it takes him thrice as much time to row up than as to row down the same distance in the river. The speed of the current is
B 6 2/3km/hr
D 7 2/3 km/hr
A 4 2/3km/hr
C 10 1/3km/hr
30s - Q3
A boat covers 800 meters in 600 seconds against the stream and returns downstream in 5 minutes. What is the speed of the boat in still water?
A. 1 m/s
D. 2.5 m/s
B. 1.5 m/s
C. 2 m/s
30s - Q4
There is a road besides a river. Two friends Ram & Shyam started their journey from place P, moved to the garden located at another place Q & then returned to place P. Ram moves by swimming at a speed of 15 km/hr while Shyam sails on a boat at a speed of about 12 km/hr. If the flow of water current is at the speed of 6 km/hr, what will be the average speed of boat sailor?
D. 18 km/hr
B.9km/hr
C.12km/hr
A.6km/hr
30s - Q5
Suppose that a person rows a boat in still water at the speed of 10 km/hr and the water runs at the speed of 4 km/hr. This person travels a certain distance & then returns. If it takes 4 hrs more for him to travel upstream than that of downstream then what will be the distance?
a.16km
b.30km
c.42km
d. 70 km
30s - Q6
A man rows ‘k’ km upstream and back again downstream to the same point in H hours. The speed of rowing in still water is s km/hr and the rate of stream is r km/hr. Then
B. (r + s) = kH / (r -s)
D. None of the above
A. (s 2 -r 2 ) =2sk /H
C. rs = kH
30s - Q7
A man can row upstream 10 kmph and downstream 20 kmph. Find the man rate in still water and rate of the stream.
A) 0,5
D) 10,5
C) 15,5
B) 5,5
30s - Q8
8.The speed of a boat in still water is 5km/hr. If the speed of the boat against the stream is 3 km/hr, what is the speed of the stream?
D. 1 km/hr
C. 2.5 km/hr
A. 1.5 km/hr
B. 2 km/hr
30s - Q9
A man rows downstream at 20 km/hr and rows upstream at 15 km/hr. At what speed he can row in still water?
C. 20.5 km/hr
A. 17.5 km/hr
B. 18 km/hr
D. 22 km/hr
30s - Q10
A man swims 12 km downstream and 10 km upstream. If he takes 2 hours each time, what is the speed of the stream?
C. 1.5 km/hr
A. 1 km/hr
D. 0.7 km/hr
B. 0.5 km/hr
30s - Q11
A boat takes 6 hours to move downstream from point P to Q and to return to point P moving upstream. If the speed of the stream is 4 km/hr and speed of the boat in still water is 6 km/hr, what is the distance between point P and Q?
D. 11 km
B. 9 km
A. 8 km
C. 10 km
30s - Q12
A man can swim in still water at 8 km/hr. If the river is flowing at 2km/hr he takes 80 minutes to reach a place and return back, how far is the place?
A. 4 km
C. 4.5 km
B. 3 km
D. 5 km
30s - Q13
A boat travels upstream from Q to P and downstream from P to Q in 3 hours. If the distance between P to Q is 4km and the speed of the stream is 1kmph, then what is the velocity of the boat in still water?
C. 5kmph
B. 4kmph
A. 3kmph
D. 7.2kmph
30s - Q14
A man swimming in a river which is flowing at 3 km/hr finds that in a given time he can swim twice as far downstream as he can swim upstream. What will be his speed in still water?
D. 11 km/hr
A. 9.5 km/hr
C. 10.5 km/hr
B. 10 lm/hr
30s - Q15
A boat travels from A to B along the stream and from B to A against the stream in 3 hours. If the velocity of the boat in still water is 4 km/hr, what is the distance between A and B?
C. 12 km
D. Data insufficient
A. 8 km
B. 10 km
30s