"Hova" means "to what location"
Answer: to the post office
"Merre" means "in what direction" or "which way"
It could also be a less inquisitive way of asking where you are going as it gives you the option of stating the direction, not the destination.
Answer: to the left, toward the park, I am going the long way, I am going home
in English and other languages there are also different ways off asking more or less this same question: where are you going to/where are you heading to....
I think the real translate is Where are you going to-The stress is on the direction where to