RRB NTPC Mains or Stage 2 Model Paper 1 with solutions

Question : 106 of 120

Marks: +1, -0

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)

Solution:

(3) 2 minutes 30 seconds = 150 seconds
3 minutes 20 seconds = 200 seconds
∴ 150 seconds Rs. 11∴200 seconds
≡Rs.[

11/150× 200]

≈ Rs. 14.7

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