Two trains, traveling towards each other, left from two stations that are 900 miles apart, at 4 pm. if the rate of the first train is 72 mph and the rate of the second train is 78 mph, at what time will they meet each other?

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.