Here time taken by both A and B is same, so the ratio of the distance covered by them will be equal to the ratio of their speeds. Therefore, ratio of the distance covered by A and B = 10:20 = 1:2 Let the distance covered by A and B be x km and 2x km respectively. According to question, => 2x – x = 15 => x = 15 Therefore, distance between them before starting = x + 2x = 3x = 45 km
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