Atrain leaves the station traveling west at a constant rate of 45 mph. an express train leaves the same station 1 hour later heading west on the same route, traveling at a constant rate of 60 mph. how many hours will the first train have been traveling when the express train catches up to it?

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.