If Chen Lanying had rented a taxi from the city, it would be expensive. The taxi would also send Chen Lanying to the entrance of the army barracks. The soldiers on duty would have told them that Chen Lanying had come in a taxi; they would have seen the vehicle.
Therefore, Chen Feitang must have sent Chen Lanying there. However, she must have been afraid that she would be recognized, so she did not send her to the entrance. Then, she must have parked the car near the entrance and waited for Chen Lanying to send the child before she picked her up and left.
They were both driving, and they had been driving almost ten minutes earlier. If Chen Feitang drove her car really fast, it would make sense if they could not catch up to her as they had slowed down to look for Chen Lanying.
"Then what about this child?" Jiang Yao looked at the sleeping child in her arms with a heavy heart, but she still made it clear. "I don't want to take him home."