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What is the probability that first scheme is more profitable over second (call ranging from 0:00 to 3:20)?

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There are two schemes in airtel mobiles.
First scheme :1 paise per second,
Second scheme :50 paise per minute,

Following conditions are given -
1) In second scheme, second minute will be started at 0:60 or 1:00,
2) 0 sec. call means to call and cut it abruptly when timer reads 0:00, this is equivalent to a call of 1 sec.
3) In first scheme 0:14 means 15 sec.

What is the probability that first scheme is more profitable over second in a call ranging from 0:00 (1 sec.) to 3:20 (201 sec.)?

posted Oct 1, 2014 by Varuna Magar

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