@ForestPoem
First, you have to understand that QProcess is running asynchronously. That means that in your two lines containing a start call, your second start is not waiting for the first process to stop.
QProcess has some handful signals that tell you what it's doing:
http://doc.qt.io/qt-5/qprocess.html#signals
In particular, you have the finished signal that tells you when the process is done. From that you can connect a slot that will start your second process, here the "route" process.
If you have a lot of processes to run in a row, I think you could add them to a QQueue member variable. Then, connect your QProcess finished signal to a custom slot that will start the next process until the QQueue is empty. You can also handle errors and decide what to do if anything wrong happens.
If you want some code example, what you try to achieve is close to this:
http://doc.qt.io/qt-5/qtnetwork-downloadmanager-example.html