Railway Exams (RRB) - Mathematics

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Q1.

Time, Work & Efficiency: $A$ can complete a railway track maintenance task in 12 days and $B$ in 18 days in 'Elementary Algebra: Polynomials, Linear and Quadratic Equations'. If they work together, in how many days will the task be finished?

(A)

$7.2$ days ($\frac{12 \times 18}{12 + 18} = \frac{216}{30} = 7.2\text{ days}$) (Elementary Algebra: Polynomials, Linear and Quadratic Equations)

(B)

6 days

(C)

8 days

(D)

9 days

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Q2.

Relative Speed & Crossing Platforms: A 240 m long train crosses a platform of length 360 m in 30 seconds in 'Elementary Algebra: Polynomials, Linear and Quadratic Equations'. What is the speed of the train in km/h?

(A)

72 km/h ($\text{Speed} = \frac{240 + 360}{30} = 20\text{ m/s} = 20 \times \frac{18}{5} = 72\text{ km/h}$) (Elementary Algebra: Polynomials, Linear and Quadratic Equations)

(B)

60 km/h

(C)

54 km/h

(D)

90 km/h

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