Q11. A man takes twice as long to row a distance against the stream as to row the same distance in favour of the stream. The ratio of the speed of the boat (in still water) and the stream is :
A. 3:1
B. 2:1
C. 4:3
D. 3:2
Q12. A man can row at 5 kmph in still water. If the velocity of current is 1 kmph and it takes him 1 hour to row to a place and come back, how far is the place ?
A. 2.4 km
B. 2.5 km
C. 3 km
D. 3.6 km
Q13. A boat covers a certain distance downstream in 1 hour, while it comes back in 3/2 hours. If the speed of the stream be 3 kmph, what is the speed of the boat in still water ?
A. 12 kmph
B. 14 kmph
C. 13 kmph
D. 15 kmph
Q14. 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.
A. 2 hours
B. 4 hours
C. 3 hours
D. 5 hours
Q15. In one hour, a boat goes 11 km along the stream and 5 km against the stream. The speed of the boat in still water (in km/hr) is:
A. 5
B. 3
C. 8
D. 9
Q16. A man takes 20 minutes to row 12 km upstream which is a third more than the time he takes on his way downstream. What is his speed in still water ?
A. 42 km/hr
B. 45 km/hr
C. 36 km/hr
D. 41 km/hr
Q17. A boat goes 12 km upstream in 48 minutes. The speed of stream is 2 km/hr. The speed of boat in still water is
A. 15 km/hr
B. 16 km/hr
C. 18 km/hr
D. 17 km/hr
Q18. A boatman can row 2 km against the stream in 20 minutes and return in 10 minutes. Find the rate of flow of the current.
A. 3 km/h
B. 5 km/h
C. 1 km/h
D. 2 km/h
Q19. A man can row 30 km upstream in 6 hours. If the speed of the man in still water is 6 km/hr, find how much he can row downstream in 10 hours
A. 200 km
B. 70 km
C. 140 km
D. 250 km
Q20. A man rows 24 km upstream in 6 hours and a distance of 35 km downstream in 7 hours. Then the speed of the man in still water is
A. 4 km/hr
B. 5.5 km/hr
C. 5 km/hr
D. 4.5 km/hr
