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A sailor sails a distance of 48 km along the flow of a river in 8 h. If It takes 12 h to return the same distance, then the speed of the flow of the river is

A) 0.5 km/h
B) 1 km/h
C) 1.5 km/h
D) 2 km/h

Correct Answer:


B) 1 km/h

Description for Correct answer:
Let speed of the flow of water be x km/h

and rate of sailing of sailor be y km/h,

Downstream speed (x + y) = \( \Large \frac{48}{8} \)

x + y = 6 ...(i)

and upstream Speed x - y = \( \Large \frac{48}{12} \)

x - y = 4 ...(ii)

On solving Eqs. (i) and (ii), we get

y = 1 km/h

Part of solved Boat and Stream questions and answers : >> Aptitude >> Boat and Stream

Comments

Similar Questions

1). Speed of motorboat in still water is 45 km/h. If the motorboat travels 80 km along the stream in 1 h 20 min, then the time taken by it to cover the same distance against the stream will be

A). 4 h 20 min

B). 3 h 40 min

C). 2 h 40 min

D). 2 h 55 min

2). A boat has to travel upstream 20 km distance from point X of a river to point Y. The total time taken by boat in travelling from point X to Y and Y to X is 41 min 40 s. What is the speed of the boat?

A). 66 km/h

B). 72 km/h

C). 48 km/h

D). Cannot be determined

3). A boat covers a distance of 30 km downstream in 2 h while it takes 6 h to cover the same distance upstream. What is the speed of the boat (in km/h)?

A). 5

B). 7.5

C). 13

D). 10

4). A boat's speed in still water is 5 km/h. While river is flowing with a speed of 2 km/h and time taken to cover a certain distance upstream is 2 h more than time taken to cover the same distance downstream. Find the distance.

A). 10.5 km

B). 11 km

C). 10.9 km

D). 15 km

5). A boat takes 9 h to travel a distance upstream and takes 3 h to travel the Same distance downstream. If the speed of the boat in still water is 4 km/h. then what is the velocity of the stream?

A). 4 km/h

B). 3 km/h

C). 6 km/h

D). 2 km/h

6). A boat running upstream distance of 10 km in 30 min and while running downstream, it covers the same distance in 25 min. What is the speed of the river current (in km/h)?

A). 20

B). 2.2

C). 2

D). Couldn't be determined

7). A man can row at 10 km/h in still water. If he takes total 5 h to go to a place 24 km away and return, then the speed of the water current is

A). 2 km/h

B). 3 km/h

C). \( \Large \frac{1}{2} \) km/h

D). 1 km/h

8). A steamer goes downstream from one port to another in 4 h. It covers the same distance upstream in 5 h. If the speed of the stream is 2 km/h, then find the distance between the two ports.

A). 50 km

B). 60 km

C). 70 km

D). 80 km

9). A man can row \( \Large 7\frac{1}{2} \) km/h in still water. If in a river running at 1.5 km/h, it takes him 50 min to row to a place and back, how far off is the place?

A). 3 km

B). 4 km

C). 1 km

D). 2 km

10). Ashutosh can row 24 km/h in still water. It takes him twice as long to row up as to row down the river. Find the rate of stream.

A). 4 km/h

B). 18 km/h

C). 8 km/h

D). 15 km/h