Ehsan was preparing to make a tape from some of his favourite songs. He noticed that Hadi's song was 1 minute longer than Bonna's song. Duration of Niaj's song was 1 minute shorter than twice the duration of Bonna's song. If the total time for these songs is 12 minutes, how long is Niaj's song?
A. 3 minutes
B. 4 minutes
C. 5 minutes
D. 7 minutes
Explanation: \(N = 2B - 1\) and \(H = B + 1\)\n\(\therefore N + H + B = 12\)\n\(\Rightarrow (2B - 1) + (B + 1) + B = 12\)\n\(\Rightarrow 4B = 12\)\n\(\Rightarrow B = 3\) minutes\nঅর্থাৎ, \(N = 2B - 1 = 2(3) - 1 = 5\) minutes
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