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.

Start free Book a demo

All Easy Hard Medium

Q1.

Time, Work & Efficiency: $A$ can complete a railway track maintenance task in 12 days and $B$ in 18 days in 'Number System: Divisibility, Unit Digits, Fractions and Decimals'. If they work together, in how many days will the task be finished?

(A)

$7.2$ days ($\frac{12 \times 18}{12 + 18} = \frac{216}{30} = 7.2\text{ days}$) (Number System: Divisibility, Unit Digits, Fractions and Decimals)

(B)

6 days

(C)

8 days

(D)

9 days

Show answer & solution

Verified Answer & Solution Locked

Q2.

Relative Speed & Crossing Platforms: A 240 m long train crosses a platform of length 360 m in 30 seconds in 'Number System: Divisibility, Unit Digits, Fractions and Decimals'. What is the speed of the train in km/h?

(A)

72 km/h ($\text{Speed} = \frac{240 + 360}{30} = 20\text{ m/s} = 20 \times \frac{18}{5} = 72\text{ km/h}$) (Number System: Divisibility, Unit Digits, Fractions and Decimals)

(B)

60 km/h

(C)

54 km/h

(D)

90 km/h

Show answer & solution

Verified Answer & Solution Locked

Protected Questions

Unlock All 55 Questions in Fundamental Operations & Commercial Math

Log in or sign up free to access every question with complete solutions, create chapter practice tests, and track your performance.

Sign up free to access all 55 questions

Unlock every Fundamental Operations & Commercial Math question, generate papers, and practice at your own pace.

Start free