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A swimmer's speed downstream is 11 km/h and speed of the stream is 1.5 km/h. Find the upstream speed of swimmer.

A) 8 km/h
B) 9.5 km/h
C) 9 km/h
D) 6.25 km/h

Correct Answer:

A) 8 km/h

Description for Correct answer:

Given, rate of stream = 1.5 km/h

We know that,

Rate of stream = \( \Large \frac{1}{2} \) (Speed downstream - Speed upstream)

=> 1.5 = \( \Large \frac{1}{2} \left(11-Speed \ upstream\right) \)

=> 11 - Speed upstream = 3

Therefore, Speed upstream => 11 - 3 = 8 km/h

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

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Similar Questions

1). A boatman rows 1 km in 5 min along the stream and 6 km in 1 h against the stream. The Speed of the stream is

A). 3 km/h

B). 6 km/h

C). 10 km/h

D). 12 km/h

2). Keshav can row 60 km downstream and 36 km upstream, taking 10 h each time. What is the velocity of the current?

A). 3 km/h

B). 2.2 km/h

C). 4 km/h

D). 1.2 km/h

3). What time will be taken by a boat to cover a distance of 128 km along the stream, if speed of a boat in still water is 24 km/h and speed of stream is 8 km/h?

A). 8 hrs

B). 4 hrs

C). 7 hrs

D). 6 hrs

4). A motorboat can travel at 10 km/h in still water. It travelled 91km downstream in a river and then returned to the same place, taking altogether 20 h. The rate of flow of river is

A). 3 km/h

B). 4 km/h

C). 2 km/h

D). 5 km/h

5). A man can row against the current three-fourth of a kilometre in 15 min and returns same distance in 10 min, then ratio of his speed to that of current is

A). 3 : 5

B). 5 : 3

C). 1 : 5

D). 5 : 1

6). The speed of the current is 5 km/h. A motorboat goes 10 km upstream and back again to the starting point in 50 min. The speed, (in km/h) of the motorboat in still water is

A). 20 km/h

B). 26 km/h

C). 25 km/h

D). 28 km/h

7). A man can row 6 km/h in still water. If the speed of the current is 2 km/h, it takes 3 h more in upstream than in the downstream for the same distance. The distance is

A). 30 km

B). 24 km

C). 20 km

D). 32km

8). A boat goes 48 km downstream in 20 h. It takes 4 h more to cover the same distance against the stream. What is the speed of the boat in still water?

A). 2.2 km/h

B). 2 km/h

C). 4 km/h

D). 4.2 km/h

9). Pawan can row 24 km/h in still water. When the river is running at 4.8 km/h, it takes him 1 h to row to a place and to come back. How far is the place?

A). 11.52 km

B). 14 km

C). 12.52 km

D). 15 km

10). Sameer can row a certain distance downstream in 24 h and can come back covering the same distance in 36 h. If the stream flows at the rate of 12 km/h, find the speed of Sameer in still water.

A). 30 km/h

B). 15 km/h

C). 40 km/h

D). 60 km/h