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Railways PYQCBT 2 2017

RRB NTPC · Question 11

A telephone bill costs Rs. 25.50 for 3 minutes 20 seconds. What is the cost, in rupees, for 5 minutes 30 seconds? (Round up to one decimal)

  1. 42.1

  2. 58.7

  3. 58.5

  4. 58.8

Show answer & explanation

Answer: (A) 42.1

Explanation

3 min 20 s = 200 s costs Rs 25.50, so 5 min 30 s = 330 s costs 25.50 × 330/200 = Rs 42.075 ≈ Rs 42.1.