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Railways PYQCBT 1 2016

RRB NTPC · Question 24

A mobile bill costs Rs. 10 for 3 minutes 30 seconds. What is the cost in rupees for 4 minutes 10 seconds? (rounded to one decimal). A. 11.9 B. 12 C. 11.8 D. 11.7

  1. A

  2. C

  3. B

  4. D

Show answer & explanation

Answer: (A) A

Explanation

3 min 30 s = 210 s costs Rs 10, so the rate is 10/210 per second. 4 min 10 s = 250 s costs 250 × 10/210 ≈ Rs 11.9.