1 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
2 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
3 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
4 A boat takes 90 minutes less to travel 36 miles downstream than to travel the same distance upstream. If the speed of the boat in still water is 10 mph, the speed of the stream is : A) 2 mph B) 2.5 mph C) 3 mph D) 4 mph E) 3.5 mph
5 A man swimming in a stream which flows 1.5 kmph, finds that in a given time he can swim twice as fast with the stream as he can against it. At what rate does he swim ? A) 4 km/hr B) 4.5 km/hr C) 5 km/hr D) 5.5 km/hr E) 6 km/hr.
6 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
7 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
8 There is a road beside a river. Two friends started from a place A, moved to a temple situated at another place B and then returned to A again. One of them moves on a cycle at a speed of 12 km/hr, while the other sails on a boat at a speed oi 10 km/hr. If the river flows at the speed of 4 km/hr, which of the two friends wit return to place A first ? A) cyclist B) boat sailor C) together D) None of these E) Cannot be Determined
9 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
10 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
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 Speed of boat in standing water is 9 km/h and the speed of the stream is 1.5 km/h. A man rows to place at distance of 105 km and comes back to the starting point. The total time taken by him is : A) 16 h B) 18 h C) 20 h D) 24 h E) 26 h
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