Anyone that knows how to use a map and do maths does. Why Not to Robinsons is right around 2km. 1st km is 8 pesos. Second is P0.50. 8+0.5=8.5 Round up since the ride is slightly over 2km and you have P9. Since P10 coins are a thing I would give them a P1 tip and hand over a P10 coin. My phone has a map app that makes finding distances very easy.