Wethermill was sitting on the verandah.

The telegram was brought to him there.

It was brought by a waiter in the hotel who remembers the incident very well.
Wethermill has seven minutes and the time it will take for Marthe Gobin to drive from the station to the Majestic.

What does he do?
He runs up first to your rooms, very likely not yet knowing what he must do.

He runs up to verify his telegram." "Are you sure of that ?" cried Ricardo.