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# Arithmetic Aptitude :: Boats and Streams

Home > Arithmetic Aptitude > Boats and Streams > General Questions
NA
SHSTTON
7
Solv. Corr.
31
Solv. In. Corr.
38
Attempted
1 M:2 S
Avg. Time

1 / 38

A man swims downstream 72 km and upstream 45 km taking 9 hours each time. what is the speed of the current?

A3 kmph

B1.5 kmph

C13 kmph

D6.5 kmph

Explanation:

Man's downstream speed = 72/ 9 kmph => 8kmph
Man's up stream speed = 45/ 9 => 5 kmph

So speed of current = (8 - 5)/2 = 1.5 kmph

Workspace

NA
SHSTTON
24
Solv. Corr.
17
Solv. In. Corr.
41
Attempted
0 M:0 S
Avg. Time

2 / 38

A boat can row upstream at 25 kmph and downstream at 35 kmph, then the speed of the current is?

A5 kmph

B10 kmph

C30 kmph

D15 kmph

Explanation:

man's upstream speed = 25 kmph
Man's downstream speed = 35 kmph
so Speed of current = (35 - 25)/2 = 5 kmph

Workspace

NA
SHSTTON
18
Solv. Corr.
15
Solv. In. Corr.
33
Attempted
0 M:0 S
Avg. Time

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The speed of a boat in still water is 15 km/hr and the rate of current is 3 km/hr the distance travelled downstream in 12 minutes is :

A2 km

B2.6 km

C3.6 km

D4 km

Explanation:

Speed downstream = (15 + 3) kmph = 18 kmph.
Distance travelled = [18 * 12/60] km = 3.6 km.

Workspace

NA
SHSTTON
25
Solv. Corr.
20
Solv. In. Corr.
45
Attempted
0 M:0 S
Avg. Time

4 / 38

A man can row his boat with the stream at 6 km/h and against the stream in 4 km/h. The man's rate is?

A1 kmph

B5 kmph

C8 kmph

D3 kmph

Explanation:

Man's row in downstream by speed = 6 kmph
and upstream by speed = 4 kmph
so man rate = (6 - 4)/2 = 1 kmph

Workspace

NA
SHSTTON
23
Solv. Corr.
12
Solv. In. Corr.
35
Attempted
0 M:0 S
Avg. Time

5 / 38

A man can row upstream at 8kmph and downstream at 13 kmph. The speed of the stream is

A2.5 km/hr

B4.2 km/hr

C5 km/hr

D10.5 km/hr

Explanation:

Speed of stream = 1/2(13 -8) kmph = 2.5 kmph.

Workspace

NA
SHSTTON
3
Solv. Corr.
15
Solv. In. Corr.
18
Attempted
0 M:0 S
Avg. Time

6 / 38

A man can swim in still water at 4.5 km/h, but takes twice as long to swim upstream than downstream. The speed of the stream is?

A3

B7.5

C2.25

D1.5

Explanation:

Swim in still water by speed = 4.5 kmph
Let's assume speed in still water = x kmph
speed in downstream =(4.5 + x) kmph
speed in upstream = (4.5 + x) kmph
Given (4.5 + x) = (4.5 - x)2
4.5 + x = 9 -2x
3x = 4.5
x = 1.5 kmph

Workspace

NA
SHSTTON
7
Solv. Corr.
9
Solv. In. Corr.
16
Attempted
0 M:0 S
Avg. Time

7 / 38

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 plce and come back, how far is the place?

A2 km

B2.4 km

C2.5 km

D3.4 km

Explanation:

Speed downstream = (5+1) kmph = 6 kmph; Speed upstream = (5 - 1)kmph = 4 kmph. Let the required distance be x km.
Then, x/6 + x/4 = 1 ? 2x + 3x = 12 ? 5x = 12 ? x = 2.4 km.

Workspace

NA
SHSTTON
7
Solv. Corr.
8
Solv. In. Corr.
15
Attempted
0 M:0 S
Avg. Time

8 / 38

A man's speed with the current is 15 km / hr and the speed of the current is 2.5 km / hr. The man's speed against the current is

A8.5 km / hr

B9 km / hr

C10 km / hr

D12.5 km / hr

Explanation:

Man's rate in still in water = (15 - 2.5) km / hr = 12.5 km / hr.
Man's rate against the current = (12.5 - 2.5) km / hr = 10 km / hr.

Workspace

NA
SHSTTON
14
Solv. Corr.
17
Solv. In. Corr.
31
Attempted
0 M:33 S
Avg. Time

9 / 38

Choose the correct option.

A man can row with a speed of 15 kmph in still water. If the stream flows at 5 kmph, then the speed in downstream is?

A10 kmph

B5 kmph

C20 kmph

D22 kmph

Explanation:

speed in still water = 15 kmph
stream speed = 5 kmph
so Downstream speed = (15 + 5) kmph = 20 kmph

Workspace

NA
SHSTTON
10
Solv. Corr.
8
Solv. In. Corr.
18
Attempted
1 M:30 S
Avg. Time

10 / 38

Choose the correct option.

A man swims downstream 30 km and upstream 18 km taking 3 hours each time, what is the speed of the man in still water?

A2 kmph

B8 kmph

C16 kmph

D4 kmph

Explanation:

Man's downstream speed = 30/3 kmph = 10 kmph

Man's upstream speed = 18/3 kmph = 6 kmph

Speed of man in still water = (10 + 6)/2 = 8 kmph

Workspace

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