Quantitative Aptitude Questions and Answers - Stream Boat Problems

11. A boat covers 12 km upstream and 18km downstream in 3hrs while it covers 18 km upstream and 12km downstream in 3(1/4) hrs the velocity of the the boat upstream and downstream?

A. 12km/hr
B. 14km/hr
C. 16km/hr
D. 18km/hr

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12. A boat takes 24 hours to cover 128 km downstream and 16 hours to cover 64 km upstream. Then the speed of the boat in still water is:

A. 14/3
B. 8/7
C. 3/2
D. 9/5

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13. A boatman can take the same time to row6.5km downstream and 3.5km upstream. His speed in still water 2.5 km/hr. The speed of the stream is:

A. 0.75km/hr
B. 2.5km/hr
C. 1.5km/hr
D. 7.5km/hr

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14. A girl can row 15 kmph in still water and he finds that it takes him thrice as long to row up as to row down the river. Find the rate of stream.

A. 4.5km/hr
B. 5.5km/hr
C. 6.5km/hr
D. 7.5km/hr

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15. A boat goes 3.5km upstream in 24 mins and the speed of the stream is 1.5km per hour, then the speed of the boat in still water is.

A. 5.25kmph
B. 7.25kmph
C. 10.25kmph
D. 12.25kmph

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16. A man can row 4 km against the stream in 40mins and return in 36mins. Find the rate of current.

A. 1/3kmph
B. 2/3kmph
C. 4/3kmph
D. 5/3kmph

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17. A motor boat sails 30 km of a river towards upstream in 10hrs. How long will it take to cover the same distance downstream, if the speed of the current is ½ of the speed of the boat in still water.

A. 1.8hr
B. 3.33hr
C. 5hr
D. 4.33hr

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18. Mohana can row 80km upstream and 110km downstream in 26 hrs. Also she can 60km upstream and 88km downstream in 20 hrs. Find the speed of the girl in still water and the speed of the current in ratio:

A. 5:6
B. 3:7
C. 7:9
D. 8:3

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19. A person can swim in water with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, what will be the time taken by the person to go 68 km downstream?

A. 1hr
B. 2hr
C. 3hr
D. 4hr

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20. A woman can row upstream at 16 km/hr and downstream at 26 km/hr. What is the speed of the stream?

A. 1km/hr
B. 5km/hr
C. 3km/hr
D. 9km/hr

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