Q1. Speed of a boat in still water is 8 km/h. If time taken by boat to cover a distance of 18 km upstream and 18 km downstream together is 6 hours. Find the speed of water current.
(a) 4 km/h
(b) 2 km/h
(c) 3 km/h
(d) 5 km/h
(e) 1 km/h
Q2. The ratio between downstream and upstream speed of a boat is 5 : 3. Find the ratio of speed of boat in still water to that of speed of current.
(a) 2 : 1
(b) 3 : 1
(c) 4 : 1
(d) 3 : 2
(e) 5 : 2
Q3. Time taken by a boat to cover upstream distance is 4 hours more than that to cover downstream distance between two points A and B. If speed of boat in still water is 6 km/h and speed of current is 2 km/h, find distance between A and B.
(a) 36 km
(b) 32 km
(c) 24 km
(d) 40 km
(e) 20 km
Q4. A man can row three quarters of a kilometer against the stream in 45/4 min. and returns in 15/2 min. with the stream. The speed of the man in still water is.
(a) 2 km/h
(b) 3 km/h
(c) 4 km/h
(d) 5 km/h
(e) 8 km/h
Q5. A boatman goes to 2 km against the current of the stream in 1 h and goes 1 km along the current in 10 min. How much time it will take to cover 5 km in still water?
(a) 1 h
(b) 1 h 15 min
(c) 3/2 h
(d) 40 min
(e) None of these
Solutions (1-5):
Q6. The current of the stream is 1 km/hr. A boat goes 35 km upstream and comes back to the starting point in 12 hrs. Find the speed of the motor boat in still water.
(a) 6 km/h
(b) 7 km/h
(c) 8.5 km/h
(d) 8 km/h
(e) 11.5 km/h
Q7. The ratio between speed of a motor boat in still water to the speed of current is 3 : 1. The downstream speed is what percent more than the upstream speed?
(a) 120%
(b) 90%
(c) 100%
(d) 150%
(e) 105%
Q8. Time taken by a swimmer going upstream and downstream is 6 h and 3 h respectively between two points A and B. If distance between A to B is 24 km, then find the speed of man in still water and speed of stream are respectively.
(a) 6 km/h, 2 km/h
(b) 12 km/h, 4 km/h
(c) 8 km/h, 3 km/h
(d) 7 km/h, 4 km/h
(e) 6 km/h, 3 km/h
Q9. A man swimming in a stream which flows 3/2 km/h, finds that in a given time he can swim twice with the stream as he can swim against it. Find the speed of man in still water.
(a) 11/2 km/h
(b) 9/2 km/h
(c) 15/2 km/h
(d) Can’t be determined
(e) 13/2 km/h
Q10. If ratio between upstream speed and downstream speed of a steamer is 2 : 5 and time taken by it covering a distance of 20 km upstream is 4 h more than that in downstream then find the speed of steamer in still water.
(a) 25/4 km/h
(b) 23/2 km/h
(c) 13/4 km/h
(d) 21/4 km/h
(e) 17/4 km/h
Solutions (6-10):
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