Finding Other Entities of the Journey Given The Average Speed

A driver takes \(45\) minutes to drive from Town \(X\) to Town \(Y\) which is \(60\) km apart.
He travels to Town \(Z\) after that, which is \(40\) km away from \(Y\). His average speed for the whole journey from Town \(X\) to Town \(Z\) is \(50\) km/h. Find the

1. total time taken for driving the whole journey from Town \(X\) to Town \(Z\).
2. speed of the driver for driving from Town \(Y\) to Town \(Z\).