Railway Exams (RRB) - Mathematics

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Q1.

RRB Mathematics (Speed, Time & Trains): A train 150 m long is running at a speed of 54 km/h in 'Elementary Algebra: Polynomials, Linear and Quadratic Equations'. How many seconds will it take to cross an electric pole?

(A)

10 seconds ($t = \frac{150}{54 \times \frac{5}{18}} = \frac{150}{15} = 10\text{ s}$) (Elementary Algebra: Polynomials, Linear and Quadratic Equations)

(B)

12 seconds

(C)

15 seconds

(D)

8 seconds

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Q2.

Number System & LCM/HCF: In 'Elementary Algebra: Polynomials, Linear and Quadratic Equations', the HCF of two numbers is 12 and their product is 2160. What is their LCM?

(A)

180 ($\text{LCM} = \frac{\text{Product}}{\text{HCF}} = \frac{2160}{12} = 180$) (Elementary Algebra: Polynomials, Linear and Quadratic Equations)

(B)

120

(C)

240

(D)

160

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