First find the size of the gap the dragon needs to close to burn Xena: 600 ft - 120 ft = <<600-120=480>>480 ft
Then find how many feet closer the dragon gets each second by subtracting Xena's speed from the dragon's speed: 30 ft/sec - 15 ft/sec = <<30-15=15>>15 ft/sec
Then divide the distance by the speed difference to find how many seconds it takes for the dragon to get close enough to burn Xena: 480 ft / 15 ft/sec = <<480/15=32>>32 sec
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