F(M), (8,16),M(m)

francesca is meeting mercedes at a store the line labeled F(m) shows the path francesca will take and the line M(m) represents the path of mercedes how long will it take for them to arive at the store

It is not possible to determine how long it will take for Francesca and Mercedes to arrive at the store without additional information such as the speeds at which they are traveling or the distance to the store.