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Problems on Boats Stream

Q21. A fisher man can row 4 km against the stream in 40 minutes and return in 30 minutes. What is the speed of the current ?
(a) 1 km/h
(b) 2 km/h
(c) 3 km/h
(d) 4 km/h

Q22. A man can row at 4 km/h in still water. If the river is running at 2 km/h, it takes him 70 minutes to row to a place and back. How far is the place ?
(a) 1½ km
(b) 1¾ km
(c) 3¼ km
(d) 3¾ km

Q23. A man can row three quaters of a kilometer against the stream in 11¼ minutes and return in 7½ minutes. The speed of the man in still water
(a) 3 km/h
(b) 4 km/h
(c) 5 km/h
(d) 6 km/h

Q24. A boat running upstream takes 7 hours 48 minutes to cover a certain distance while it takes 4 hours to cover the same distance running downstream. What is the ratio between speed of the boat and the speed of water current respectively ?
(a) 37 : 14
(b) 41 : 16
(c) 52 : 18
(d) 59 : 19

Q25. A boat goes 30 km downstream and 24 km upstream in 6 hours. It goes 39 km upstream and 26 km downstream in 6 hour 30 minutes. The speed of the boat in still water is
(a) 7.4 km/h
(b) 8.9 km/h
(c) 10.5 km/h
(d) 12.3 km/h



Q26. A boatman goes 2 km against the current of stream in 30 minutes and return to the same spot in 20 minutes. What is his rate of rowing in still water ?
(a) 5 km/h
(b) 7 km/h
(c) 12 km/h
(d) 13 km/h

Q27. The speed of a boat in still water is 14 km/h. It can go 30 km upstream and return downstream to the original point in 5 hour. The speed of the stream is
(a) 4 km/h
(b) 6 km/h
(c) 7 km/h
(d) 8 km/h

Q28. A boat running downstream covers 24 km in 4 hr, while for covering the same distance upstream it takes 6 hours. What is the speed of the boat in still water ?
(a) 3 km/h
(b) 5 km/h
(c) 6 km/h
(d) 9 km/h

Q29. A steamer goes downstream from one port to another in 4 hours. It covers the same distance upstream in 5 hours. If the speed of the stream is 2 km/h, the distance between the two ports is
(a) 52 km
(b) 55 km
(c) 65 km
(d) 80 km

Q30. A boat goes 20 km downstream in 10 hours, It takes 2 hours more to cover the same distance against the stream. What is the speed of the boat in still water ?
(a) 1.52 km/h
(b) 1.83 km/h
(c) 2.15 km/h
(d) 2.77 km/h


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