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- 1. A man can row downstream at the rate of 12 Km/hr and upstream at 6 Km/hr. Find man's rate in still water and the rate of current?

A.9,6

B.6,3

C.9,3

D.6,6

Answer & Explanation

Answer: Option C

Explanation:**Rate of still water = 1/2 (12 + 6) = 9 Km/hr**

Rate of current = 1/2 (12-6) = 3 Km/hr

Rate of current = 1/2 (12-6) = 3 Km/hr

- 2. A man can row 14 Kmph in still water. It takes him twice as long to row up as to row down the river. Find the rate of stream?

A.17.6 Km/hr

B.18.6 Km/hr

C.19.6 Km/hr

D.18.6 m/hr

Answer & Explanation

Answer: Option B

Explanation:**Let man's rate upstream be x kmph**

Then his rate downstream = 2x kmph

Rate in still water = 1/2 (2x + x)

3x/2= 14 Kmph

3x = 28

x = 9.3

Rate of upstream = 9.3 Km/hr

Rate of downstream =18.6 Km/hr

Then his rate downstream = 2x kmph

Rate in still water = 1/2 (2x + x)

3x/2= 14 Kmph

3x = 28

x = 9.3

Rate of upstream = 9.3 Km/hr

Rate of downstream =18.6 Km/hr

- 3. A man rows down stream 40 km and upstream 21 km taking 4 hrs each time. what is the velocity of current?

A.2.735 Kmph

B.

**2.375 kmph**C.2. 573 kmph

D.2 kmph

Answer & Explanation

Answer: Option B

Explanation:**Man's rate downstream = 40/4 = 10 Kmph**

Man's rate upstream = 21/4 = 5.25 Kmph

Velocity of current = 1/2( 10 - 5.25)

= 2.375 Kmph

Man's rate upstream = 21/4 = 5.25 Kmph

Velocity of current = 1/2( 10 - 5.25)

= 2.375 Kmph

- 4. A man can row 12 Kmph in stil water and the river is running at 4 Kmph. If the man takes 2 hour to row to a place and back how far is the place?

A.3 Km

B.2.66 Km

C.10.66 Km

D.9 Km

Answer & Explanation

Answer: Option C

Explanation:**Man's rate down stream = 12 + 4 = 16 kmph**

Man's rate upstream = 12 - 4 = 8 kmph

Let the required distence be x Km

then, x/16 +x/8 = 2

3x = 32

x = 10.66 Km.

Man's rate upstream = 12 - 4 = 8 kmph

Let the required distence be x Km

then, x/16 +x/8 = 2

3x = 32

x = 10.66 Km.

- 5. A man can row downstream at the rate of 32 Kmph and upstream at 8 Kmph. Find the man’s rate in still water and rate of current?

A.20 Kmph, 10 Kmph

B.12 Kmph, 22 Kmph

C.22 Kmph, 12 Kmph

D.20 Kmph, 12 Kmph

Answer & Explanation

Answer: Option D

Explanation:**Rate of still water = 1/2 (down stream + upstream)**

**= 1/2 (32 + 8) = 20 Kmph**

**Rate of current = 1/2 (down stream - upstream)**

**= 1/2 (32 - 8)**

**= 1/2 (24)**

**= 12 kmph**

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