1 The speed of a motor boat to that of the current of water is 36 : 5. The boat goes along with the current in 5 hours 10 minutes. It will come back in A) 5 hrs 50 mts B) 6 hrs C) 6 hrs 50 mts D) 12 hrs 10 mts E) 10 hrs 10 mts
2 A boat takes half time in moving a certain distance downstream than upstream. What is the ratio between rate in still water and rate of current? A) 1 : 2 B) 3 : 1 C) 2 : 1 D) 1 : 3 E) 2 : 3
3 The speed of a boat in still water is 8 km/hr. If it can travel 20 km down stream at the same time as it can travel 12 km upstream, the rate of stream (in km/hr) is A) 2 B) 1 C) 4 D) 3 E) 5
4 A man swims downstream 40 km in 4 hours and upstream 24 km in 3 hours. Find his speed in still water. A) 9 km/hr B) 10 km/hr C) 11 km/hr D) 12 km/hr E) 13 km/hr
5 A motorboat, whose speed is 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream (in km/hr) is : A) 4 B) 5 C) 6 D) 10 E) 11
6 A boat covers 24 km upstream and 36 km downstream in 6 hours while it covers 36 km upstream and 24 km downstream in $6 \frac{1}{2}$ hours. The velocity of the current is : A) 1 km/hr B) 1.5 km/hr C) 2 km/hr D) 2.5 km/hr E) 3 km/hr
7 A man takes 3 hours 45 minutes to row a boat 15 km downstream of a river and 2 hours 30 minutes to cover a distance of 5 km upstream. Find the speed of the river current in km/hr. A) 1 km/hr B) 2 km/hr C) 1.5 km/hr D) 8 km/hr E) 7 km/hr
8 A man can row $7\frac{1}{2}$ kmph in still water. If in a river running at 1.5 km an hour, it takes him 50 minutes to row to a place and back, how far off is the place ? A) 3 km/hr B) 4 km/hr C) 5 km/hr D) 6 km/hr E) 7 km/hr
9 A man can row 40 km upstream and 55 km downstream in 13 hours. Also, he can row 30 km upstream and 44 km downstream in 10 hours. Find the speed of the man in still water and the speed of the current. A) 4 km/hr B) 1 km/hr C) 2 km/hr D) 3 km/hr E) 5 km/hr
10 A streamer goes downstream from one port to another in 4 hours. It covers the same distance upstream in 5 hours. If the speed of stream is 2 km/h, the distance between the two ports is A) 50 km B) 60 km C) 70 km D) 80 km E) 75 km
11 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 E) 4 km
12 A motor boat goes 15 km against the stream running at 4 km/h and back in 2 hours. The speed in km/h of the motorboat in still water is A) 16 B) 15 C) 13.5 D) 18 E) 19
13 The speed of motorboat in still water is 6 km/h. A motor boat goes 7 km upstream and back to the starting point in $2\frac{2}{5}$ hrs. The velocity of the current is A) 1.2 km/h B) 3 km/h C) 1.5km/h D) 1.3 km/h E) 1 km/h
14 A motor boat can travel at 10 km/h in still water .If travelled 91 km downstream in a river and then returned ,taking altogether 20 hrs .Find the rate of flow of river A) 3 km/h B) 4 km/h C) 4.5 km/h D) 5 km/h E) 5.26 km/h
15 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) 2 : 1 B) 3 : 1 C) 3 : 2 D) 4 : 2 E) None of these
