RRB NTPC · Question 106
A telephone bill costs Rs. 11 for 2 minutes 30 seconds. What is the cost (in rupees) for 3 minutes 20 seconds? (Round up to one decimal)
Show answer & explanation
Answer: (C) 14.7
Explanation
2 min 30 s = 150 s costs Rs 11, so 3 min 20 s = 200 s costs 11 × 200/150 = Rs 14.67 ≈ Rs 14.7.