Boats and Streams Questions for RRB Group-D PDF

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Boats and Streams Questions for RRB Group-D PDF
Boats and Streams Questions for RRB Group-D PDF

Boats and Streams Questions for RRB Group-D PDF

Download Top-10 RRB Group-D Boats and Streams Questions PDF. RRB GROUP-D Boats and Streams questions based on asked questions in previous exam papers very important for the Railway Group-D exam.

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Question 1: A boat can cover a distance of 7.2 km downstream and 3.2 km upstream in 2
hours.It can also cover 1.5 km downstream and 0.6 km upstream in 24 minutes. Whatis the
speed of the boat when going downstream (in km/h)?
LATEX

a) Latex 1

b) Latex 2

c) Latex 3

d) Latex 4

Question 2: A boat travels 30 km upstream in 10 hours and travels 52 km downstream in 4 hours. What is the time taken to cover 121 km downstream if the speeds of both stream and boat are decreased by 1 km/hr ?

a) 12 hrs

b) 11 hrs

c) 10 hrs

d) 9 hrs

Question 3: A boat travels 120 km upstream in 6 hours and travels 90 km downstream with double the speed of upstream. What is the time taken to cover the 90km downstream ?

a) 2 hr 10 min

b) 2 hr 15 min

c) 2 hr 20 min

d) 2 hr 30 min

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Question 4: A boat at anchor is racked by waves whose consecutive crests are 125 m apart. The velocity of the wave of the moving crests is 25ms1, What is the frequency of the rocking of the boat?

a) 0.20 (Hz)

b) 625 (Hz)

c) 250 (Hz)

d) 100 (Hz)

Question 5: A man can row a boat at 10 kmph in still water. If the speed of the stream is 6 kmph, the time taken to row a distance of 80 km down the stream is :

a) 8 hours

b) 5 hours

c) 10 hours

d) 20 hours

Question 6: Speed of a boat in standing water is 9 kmph and the speed of the stream is 1.5 kmph. man rows to a place at a distance of 10.5 km and comes back to the starting point. The total time taken by him is :

a) 1.6 hours

b) 1.8 hours

c) 2.0 hours

d) 2.4 hours

d) Rs. 4500

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Question 7: A boat takes 4 hours to travel same distance ‘x’ upstream and downstream.If the speed of the boat is 4 km/hr and stream is 2 km/hr then find the value of x ?

a) 6 km

b) 8 km

c) 4 km

d) 10 km

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Question 8: A boat takes 10 hours to travel same distance ‘x’ upstream and downstream.If the speed of the boat is 10 km/hr and stream is 6 km/hr then find the value of x ?

a) 24 km

b) 28 km

c) 30 km

d) 32 km

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Question 9: A boat goes 2 km upstream and 3 km downstream in 45 minutes while it goes 3 km upstream and 9 km downstream in 90 minutes. Whatis the speed (in km/hr) of boat when going down stream?

a) 9

b) 10.5

c) 12

d) 9.5

Question 10: The speed of a boat in still water is 9 km/hr and the speed of stream is 3 km/hr. The difference between the upstream speed and downstream speed will be:

a) 6 km/hr

b) 5 km/hr

c) 3.5 km/hr

d) 7.5 km/hr

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Answers & Solutions:

1) Answer (B)

2) Answer (B)

let the speed of the boat be ‘b’ and stream be ‘s’.
30/(b-s) =10
b-s=3
52/(b+s) =4
b+s=13
b-s=3
2b=16
b=8 km/hr
s=5 km/hr
Each is decreased by 1 km/hr so
b=7 km/hr
s=4 km/hr
Time taken for 121 km downstream=121/11
=11 hrs

3) Answer (B)

let the speed of the boat be ‘b’ and stream be ‘s’.
120/(b-s) =6
b-s=20
Given b+s=2(b-s)
b+s=2b-2s
3s=b
3s-s=20
2s=20
s=10
b=30
Time taken for 90 km downstream=90/40
=2.25 hrs

4) Answer (A)

5) Answer (B)

6) Answer (D)

7) Answer (A)

Upstream speed =4-2=2 km/hr
Downstream speed=4+2=6 km/hr
Therefore we have x6+x2=6
4x/6 =4
x=6 km

8) Answer (D)

Upstream speed =10-6=4 km/hr
Downstream speed=10+6=16 km/hr
Therefore we have x16+x4=10
5x/16 =10
x=32

9) Answer (C)

10) Answer (A)

Speed in upstream=9-3 =6 km/hr
Speed in downstream=9+3=12 km/hr
Difference=6 km/hr

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We hope this Boats and Streams Questions  PDF for RRB Group-D Exam will be highly useful for your preparation.

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