question

Not sure why you wouldn't want to use Process Flow, it's a great tool once you learn how to use it.

Since you want a dynamic travel time, the speed of the transporter needs to change. If you want to keep it simple and not worry about acceleration you can use the equation:

Distance = Velocity * Time

we can solve for velocity

Velocity = Distance / Time

Now we just need to get the distance. Once you give a task sequence to the transporter, the On Receive Task Sequence trigger will fire on the transporter. You can then get the distance to travel using:

double distance = distancetotravel(current, taskSequence.tasks[1].involved1);

Based upon the set of tasks in your task sequence the tasks[i] will change.

Now you can set the speed of the transporter using

setvarnum(current, "maxspeed", distance / travelTime)

If you need to account for the acceleration and deceleration then you'll need to subtract that time from total time. Hopefully your acceleration and deceleration are constant.

Distance = Velocity * Time + 1/2 * Acceleration * Time^2 + 1/2 * Deceleration * Time^2
Velocity = Distance - 1/2 * Acceleration * Time^2 - 1/2 * Deceleration * Time ^2

Now you do the above steps and set the transporters maxspeed variable to the result of the velocity equation.

I hope this helps!