Railway Exams (RRB) - Mathematics

Fundamental Operations & Commercial Math question bank (Arithmetic & Number Systems)

Practice 111 free Railway Exams (RRB) - Mathematics Arithmetic & Number Systems - Fundamental Operations & Commercial Math questions with answers and step-by-step solutions.

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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 'Number System: Divisibility, Unit Digits, Fractions and Decimals'. How many seconds will it take to cross an electric pole?

(A)

10 seconds ($t = \frac{150}{54 \times \frac{5}{18}} = \frac{150}{15} = 10\text{ s}$) (Number System: Divisibility, Unit Digits, Fractions and Decimals)

(B)

12 seconds

(C)

15 seconds

(D)

8 seconds

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Q2.

Number System & LCM/HCF: In 'Number System: Divisibility, Unit Digits, Fractions and Decimals', the HCF of two numbers is 12 and their product is 2160. What is their LCM?

(A)

180 ($\text{LCM} = \frac{\text{Product}}{\text{HCF}} = \frac{2160}{12} = 180$) (Number System: Divisibility, Unit Digits, Fractions and Decimals)

(B)

120

(C)

240

(D)

160

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