Rrb Ntpc Exam Template With Answers Page 20
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27RRB NTPC Pre 2016 : Practice Paper - 1
Time taken = 80/8 = 10 kmph
19.
==>. 8(x+4) = 12(x-4)
Part filled by B from 9 am to 11 am
==> 8x + 32 = 12x - 48
==> X = 80/4 = 20 kmph
Total part filled till 11 am
20.
Speed of Downstream = 15+3 = 18 kmph
Speed of Upstream = 15-3 = 12 kmph
==> X/12 - X/18 = 3
==> X = 36 x 3
At 11 am pipe C is opened to empty it
==> X = 108 km
∴ Part of thank emptied in 1 hr
21.
90 – 60 = 50
30×(5/18) = 25/3 m/s
∴ 11/30 part will be
Distance covered in 20sec = 24 ×(25/3) = 200
emptied in
Length of each train = 200/2 = 100
22.
1st Bottle Contains 80% of milk and 20% water
2nd Bottle Contains 70% of milk and 30% water
.e. at 2:40 pm
Milk ratio = 80 : 70 = 8:7
17. 4;
23.
Let the width of the path be x km
Let original price = Rs.100
∴ Area of the path
30% discount = Rs.30
= 38 x 32 - (38 - 2x) (32 - 2x)
CP = 70
= 1216 - 1216 + 140x - 4x²
SP = (150/100)×70 = 105
= 140x - 4x²
Percentage = (105 – 100 )% = 5%
∴ 140x - 4x² = 600
⇒ 4x² - 140x + 600 = 0
24.
⇒ x² - 35x+ 150 = 0
==> 1 – no boy is selected
⇒ x (x-30 ) - 5 (x-30) = 0
==> 1 – 6c4/11c4 = 21/22
⇒ (x-5) (x-30) =0
∴ x = 5 as x ≠30
25.
10+15+10 = 35%
100-35 = 65% = 26,000
18.
65% ------- 26,000
Along with stream = Down Stream = 6+2 = 8 kmph
Page 20
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