Question 1
Alvin, Marcus and Paul are schoolmates. Every Monday, they go to the same learning center from school at different times. Alvin leaves the school at 1 pm and reaches at 1 : 45pm. Marcus leaves the school at 2 : 05pm and reaches at 2 : 30pm. Paul leaves the school at 2 : 55pm and reaches at 3 : 25pm. Who takes the shortest time to reach the learning center among the three of them?