SBI clerk prelims 22 Feb 2020 Questions and Answers Detailed Explanation
MOST IMPORTANT previous year question answers - 2 EXERCISES
The following question based on SBI clerk topic of previous year question answers
(a) $120/7$ days
(b) 24 days
(c) $180/13$ days
(d) 15 days
e) 18 days
The correct answers to the above question in:
Answer: (d)
let total work be 360 units
Efficiency of 1 man = $360/\text"12×10"$ = 3 units/day
Efficiency of 1 woman = $360/\text"10×18"$ = 2 units/day
Required time = $360/\text"4×3+6×2"$ = 15 days
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Question : 1
A car can cover a distance in 4 hour at speed 60 kmph then by what percent should the speed of car be increased to cover the same distance in 2.5 hr?
a) 60%
b) 40%
c) 50%
d) 100%
e) 75%
Answer »Answer: (a)
distance = 240 kms
Required speed = $240/2.5$ = 96 kmph
Required % = $\text"96−60"/60 × 100$ = 60%
Question : 2
The ratio of the ages of Ram and Rahim 10 years ago was 1 : 3. The ratio of their ages five years hence will be 2 : 3. Then, the ratio of their present ages is :
a) 1 : 2
b) 3 : 5
c) 3 : 4
d) 2 : 5
e) None of these
Answer »Answer: (b)
Let 10 years ago, ages of Ram and Rahim were x years and 3x years, respectively.
Then, present age of Ram = (x + 10)
and present age of Rahim = (3x + 10)
According to the question,
$\text"x+10+5"/\text"3x+10+5" = 2/3$
⇒ 3x + 45 = 6x + 30
⇒ 3x = 15
∴ x = 5
Hence, required ratio = $\text"5+10"/\text"3×5+10"$
= $15/25$
= 3 : 5
Question : 3
Two trains of length 140m & 120m are running in same direction on parallel tracks with speeds 132 kmph & 80 kmph respectively. How much time will they take to cross each other?
a) 7.09 sec
b) 18 sec
c) 11.7 sec
d) 4.42 sec
e) Cannot be determined
Answer »Answer: (b)
Required time = $\text"140+120"/\text"(132−80)× 5/18"$
= $\text"260×18"/\text"52×5"$
= 18 sec
Directions:
What will come in the place of question (?) mark in following number series:
Question : 4
72000, 36000, 12000, 3000, 600, ?
a) 120
b) 200
c) 30
d) 150
e) 100
Answer »Answer: (e)
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