Gilda walks to the train station. If she walks at the rate of 3 mph, she misses her train by 7 minutes. However, if she walks at the rate of 4 mph, she reaches the station 5 minutes before the arrival of the train. Find the distance Gilda walks to the station. David knew he made a mistake when he calculated that Gilda walks 123 miles to the station. Read through David's calculations: Using , the distance is the same, but the rate and time are different. If Gilda misses the train, it means the time needs 7 more minutes at a rate of 3 mph, so . If she gets to the station 5 minutes early it means the time can be 5 minutes less at a rate of 4 mph, so . , so Find David's mistake in his calculations. In two or more complete sentences, explain his mistake. Include the correct calculations and solutions in your answer.