Railway Rrb Exam Template With Answers Page 31
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42Railway RRB : Model paper 1
25. Option B
st
nd
Filling by (A + B) in 1
hr 1/12 + 1/15 = 3/20, filling by (A +C) in 2
hr. = 1/12 +
1/20 = 2/15
Filling done in first 2 hr 3/20 + 2/15 = 17/60 in first 6hr = 17/60 × 3 = 15/60, Rest
filling = 1 – 51/60 = 2/15
/
/
th
Now in 7
hr, filling is done by (A + B) in
= 1 hour
Total time = 7 hour
26. Option B
Use the formula as given below:
4 men + 24 boys can do it in
days
×
For 50 × 0.9 times great, they can do in
×
× 50 = 612 days
27. Option B
7 + 3 √ 5 (7 ⎯ 3 √ 5 ) = (7) ⎯ ( 3 √ 5) = √ 49 ⎯ 45 = √ 4 = 2
28. Option B
Let √ 0.0169 × x = 1.3
Then, 0.0169x = (1.3) = 1.69
.
.
x =
= 100
Page 30
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