Dispelling multi-target spells - i.e. Slow

[jodyjohnson]

When a multi-target spell (mass haste, slow, etc.) is dispelled does it cancel the effect for all the targets of the single casting?

4 guys are slowed, and one gets hasted (to cancel the effect). Do all get returned to normal?

5 party members spread across a 100' area are under a Mass Haste and the spell is cancelled by a Slow or targetted Dispel Magic. Do all the targets lose their haste effect regardless of their distance from each other?

 

[shilsen]

When a multi-target spell (mass haste, slow, etc.) is dispelled does it cancel the effect for all the targets of the single casting?

Only if they are all targeted by the dispel.

4 guys are slowed, and one gets hasted (to cancel the effect). Do all get returned to normal?

No. Just the one guy.

5 party members spread across a 100' area are under a Mass Haste and the spell is cancelled by a Slow or targetted Dispel Magic. Do all the targets lose their haste effect regardless of their distance from each other?

No. They would have to all be within 30 ft. of each other (and all chosen as targets) for the Slow spell to work. Same for the dispel magic, which would have to be an area dispel to (potentially) affect all of them.