1 A person can row a boat $d$ km upstream and the same distance downstream in 5 hours 15 minutes. Also, he can row the boat $2d $ km upstream in 7 hours. How long will it take to row the same distance $2d$ km downstream? A) 7 hours B) $7\frac{1}{3}$ hours C) $7\frac{1}{4}$ hours D) $7\frac{1}{2}$ hours E) $7\frac{1}{9}$ hours
2 The speed of a boat in still water is 10 km/hr. If it can travel 26 km downstream and 14 km upstream in the same time, the speed of the stream is : A) 2 km/hr B) 2.5 km/hr C) 3 km/hr D) 4 km/hr E) 5 km/hr
3 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
4 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
5 A man can row 18 kmph in still water. It takes him thrice as long to row up as to row down the river. Find the rate of stream. A) 7 km/hr B) 10 km/hr C) 9 km/hr D) 8 km/hr E) 9 km/hr
6 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
7 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
8 A man rows 10 km upstream and back again to the starting point in 55 min. If the speed of stream is 2 km/h, find the speed of rowing in still water. A) 22 km/h B) 18 km/h C) 20 km/h D) 25 km/h E) 28 km/h
9 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
10 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
11 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
12 A boat takes 19 h for travelling downstream from point A to point B and coming back to point C, midway between A and B. If velocity of the stream is 4 km/h and the speed of the boat in still water is 14 km/h. What is the distance between A and B ? A) 160 km B) 180 km C) 200 km D) 220 km E) 240 km
13 The speed of boat in still water is 20 km/h, if it can travel 16 km upstream in 1 h. What time it would take to travel the same distance downstream? A) 20 min B) 40 min C) 30 min D) 15 min E) 45 min
Each of the questions given below consists of two statements numbered I and II given below it. Please read the questions carefully and decide whether the data provided in the statement(s) is / are sufficient to answer the given question. 14 What the speed of the man in still water? I. The man can swim a distance of $48$ kms in $6$ hours with upstream. II. The man can swim the same distance in $4$ hours with downstream. A) I alone sufficient while II alone not sufficient to answer B) II alone sufficient while I alone not sufficient to answer C) Either I or II alone sufficient to answer D) Both I and II are not sufficient to answer E) Both I and II are necessary to answer
Each of the questions given below consists of three statements, numbered I, II and II respectively. Please read the question and the statements carefully and decide which of the statement(s) is/are necessary to answer the question. 15 Find the speed of the man in still water ? I. The downstream speed is $12$ km/hr. II. The upstream speed is $4$ km/hr. III. In a back-and-forth travel between two points, $A$ and $B$, the average speed of the man was $6$ km/hr. A) I and II only B) All I, II and III C) III, and either I or II D) Any two of the three E) None of these