The probability that the LPG will last atmost 90 days =0.6 Thus, the probability that the LPG will last more than 90 days =0.4 The probability that the LPG will last more than 60 days = 0.8 = The probability that the LPG will last 60 to 90 days + The probability that the LPG will last more than 90 days Hence, 0.4 + The probability that the LPG will last 60 to 90 days = 0.8 Hence, The probability that the LPG will last 60 to 90 days = 0.8- 0.4 = 0.4 Hence, option A is the correct answer.