Hi.
You can use a Float variable inside the animator to affect the animation speed.
In the animator, select a state with the animation that you want to manipulate by speed.
In the inspector below 'Speed' you can see 'Multiplier'.
Check the parameter and set the float variable there.
You can set it default to 1.
in playmaker you can use "Set Animator Float" to adjust the multiplier.
To know if animation is ended you can for example use :
Get Animator Current Transition Info Is Tag
and set a tag on the 2nd animation.
You can also do a send event from within the animation itself, but you will need to have an fsm on the same object as the animator.
here is a video about the event (btw it will not popup anymore, but it will show in the inspector)