how to show digit time in a timer in qt?

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QT-Creator

timer

I want to create a timer in QT that shows minutes, seconds and hundreds of a second. I want to show digits in a QPlaniTextEdit. When I push the start_button, there must be timer showed in QPlaintextedit. I wrote this code but I don't know how to show the time and what to write in slot. My timer should be working until the pause button is pushed. Please help me.

class Mainwindo::public Mainwidow

Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
public slots:

void on_clicked_start();
private:

QPushButton* start;
QPushButton* pause;
QPlainTextEdit* pl;
QElapsedTimer* time;
Ui::MainWindow *ui;
};
connect(start,SIGNAL(clicked()),this,SLOT(on_clicked_start()));
void MainWindow::on_clicked_start()

{
QString temp;
temp=QString::number(time->elapsed());
Myplaintext->setPlainText(temp);
}