Boats and Stream Questions in English for the SSC CGL, CPO, CHSL, Bank and all competitive exams. Practice set of previous year MCQ question for the preparation of upcoming examinations.

## Boats and Stream Questions Practice Set

**Question 1:** A man rows a boat 18 kilometres in 4 hours downstream and returns upstream in 12 hours. The speed of the stream (in km per hour) is :

(1) 1

(2) 1.5

(3) 2

(4) 1.75

###### Show Answer

Rate downstream= = =4.5 km/hr

Rate upstream = = 1.5 km/hr

speed of the stream= = = 1.5 km/hr

**Question 2:** A motorboat in still water travels at a speed of 36 kmph. It goes 56 km upstream in 1 hour 45 minutes. The time taken by it to cover the same distance down the stream will be :

(1) 2 hours 25 minutes

(2) 3 hours

(3) 1 hour 24 minutes

(4) 2 hours 21 minutes

###### Show Answer

Speed of the motorboat upstream= = 32 kmph

Let the speed of the current be x kmph=36 – x = 32, x= 4 kmph

Speed of motor boat downstream = 36 + 4 = 40 kmph

Time taken to cover 56 km at 40 kmph =

= hour= 1 hour 24 minutes

**Question 3:** The speed of a boat in still water is 10 km/hr. It covers (upstream) a distance of 45 km in 6 hours. The speed (in km/hr) of the stream is

(1) 2.5

(2) 3

(3) 3.5

(4) 4

###### Show Answer

Upstream speed of boat=

= =7.5 km/hr

Speed of current = 10-7.5=2.5 km/hr

**Question 4:** A man rows 40 km upstream in 8 hours and a distance of 36 km downstream in 6 hours. Then speed of stream is

(1) 0.5 km/hr

(2) 1.5 km/hr

(3) 1 km/hr

(4) 3 km/hr

###### Show Answer

Speed of stream= ( )

== 0.5 km/hr

**Question 5:** A boat travels 24 km upstream in 6 hours and 20 km downstream in 4 hours. Then the speed of boat in still water and the speed of water current are respectively

(1) 4 kmph and 3 kmph

(2) 4.5 kmph and 0.5 kmph

(3) 4 kmph and 2 kmph

(4) 5 kmph and 2 kmph

###### Show Answer

Rate upstream = 4 kmph

Rate downstream = 5 kmph

Speed of boat in still water= (4+5)=4.5 kmph

Speed of current= (5-4)=0.5 kmph

**Question 6:** If a boat goes 100 km downstream in 10 hours and 75 km upstream in 15 hours, then the speed of the stream is

(1) 2 km/hour

(2) 2·5 km/hour

(3) 3 km/hour

(4) 3·5 km/hour

###### Show Answer

Rate downstream = 10 kmph

Rate upstream = 5 kmph

Speed of current= (10-5)

=2·5 km/hour

**Question 7:** A man can swim at the rate of 4 km/hr in still water. If the speed of the water is 2 km/hr, then the time taken by him to swim 10 km upstream is

(1) 2 hrs

(2) 3 hrs

(3) 5 hrs

(4) 4 hrs

###### Show Answer

Rate upstream = 4 – 2 = 2 kmph

Required time = = 5 hrs

**Question 8:** A man can swim 3 km/hr. in still water. If the velocity of the stream is 2 km/hr., the time taken by him to swim to a place 10 km upstream and back is :

(1) 9 hr

(2) 10 hr

(3) 12 hr

(4) 8 hr

###### Show Answer

Rate downstream = 5 kmph

Rate upstream = 1 kmph

Required time= +

=12 hours

**Question 9:** A man can row 15km/ hr downstream and 9 km/hr upstream. The speed of the boat in still water is

(1) 8 km/hr

(2) 10 km/hr.

(3) 15 km/hr

(4) 12 km/ hr

###### Show Answer

Speed of boat in still water

= (Rate downstream + Rate upstream) =

=(15 + 9)

= 12 kmph

**Question 10:** A man swims downstream a distance of 15 km in 1 hour. If the speed of the current is 5 km/hour, the time taken by the man to swim the same distance upstream is

(1) 1 hour 30 minutes

(2) 45 minutes

(3) 2 hours 30 minutes

(4) 3 hours

###### Show Answer

Let the speed of man in still water be x kmph.

=1

x + 5 = 15

x = 10 kmph

Time taken in swimming upstream

= 3 hour

**Question 11:** A man rows down a river 15 km in 3 hrs. with the stream and returns in 7 hrs, The rate at which he rows in still water is

(1) 2.5 km/hr

(2) 1.5 km/hr

(3) 3.5 km/hr

(4) 4.5 km/h

###### Show Answer

Let speed of person in still water = x kmph and speed of current = y kmph

x+y = = 5 kmph

x-y= = 2 kmph

on adding

2x= 7 kmph

x=3.5 kmph

**Question 12 :** A boat takes half time in moving a certain distance downstream than upstream. The ratio of the speed of the boat in still water and that of the current is

(1) 2 : 1

(2) 1 : 2

(3) 4 : 3

(4) 3 : 1

###### Show Answer

Speed of boat in still water = x kmph (let)

Speed of current = y kmph

Rate downstream = (x + y) kmph

Rate upstream = (x – y) kmph

Distance = Speed × Time

(x – y) × 2t = (x + y) × t

2x – 2y = x + y

2x – x = 2y + y

x = 3y

= = 3 : 1

**Question 13:** A boat moves downstream at the rate of 8 km per hour and upstream at 4 km per hour. The speed of the boat in still waters is :

(1) 4.5 km per hour

(2) 5 km per hour

(3) 6 km per hour

(4) 6.4 km per hour

###### Show Answer

Speed of boat in still water

= (Rate downstream + rate upstream)

= (8 + 4) kmph =

= kmph

= 6 kmph

**Question 14 :** A boat goes 6 km an hour in still water, but takes thrice as much time in going the same distance against the current. The speed of the current (in km/hour) is :

(1) 4

(2) 5

(3) 3

(4) 2

###### Show Answer

Let the speed of the current be x kmph.

According to the question,

= 3

18 – 3x = 6

3x = 18 – 6

x=4

**Question 15 :** A boat can travel with a speed of 13 km/hr in still water. If the speed of stream is 4 km/hr in the same direction, time taken by boat to go 63 km in opposite direction is

(1) 9 hrs

(2) 4 hrs

(3) 7 hrs

(4) 3 hrs

###### Show Answer

Rate upstream of boat

= 13 – 4 = 9 kmph

Required time =

=

= 7 hours

**Question 16 :** A boat covers 20 km in 4 hours along the current and 9 km in 3 hours against the current. What is the speed of the current ?

(1) 2 kmph

(2) 1 kmph

(3) 1.5 kmph

(4) 1.75 kmph

###### Show Answer

Answer: (2) 1 kmph

Rate downstream= = 5 kmph

Rate upstream = = 3 kmph

Speed of current= (5-3)= 1 kmph

**Question 17**: A boat running down stream covers a distance of 16 km in 2 hours while for covering the same distance upstream it takes 4 hours. What is the speed of the boat in still water ?

(1) 4 kmph

(2) 6 kmph

(3) 8 kmph

(4) Data inadequate

###### Show Answer

Rate upstream = kmph = 8 kmph

Rate downs stream = = 4 kmph

Rate in still water= (8+4) kmph = 6 kmph

Thanks for attempt Boats and Stream Questions practice set for the preparation of competitive exams.

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