It takes 1 hour for refrigerated dough to come to room temperature. It takes 15 minutes to shape the dough and 2 hours to proof. The bread takes 30 minutes to bake and 15 minutes to cool. If the bakery opens at 6:00 am, what is the latest time the head baker can make it to the store to start working? Think carefully first, then make a decision:
It takes 1 hour to bring the dough to room temp and 2 hours to proof the dough so that's 1 + 2 = 3 hours. It takes 15 minutes to shape the dough, 30 minutes to bake and another 15 minutes to cool for a total of 15 + 30 + 15 = 60 minutes. There are 60 minutes in 1 hour so that takes him 60 / 60 = 1 hour. In total it takes 3 + 1 = 4 hours from start to finish to make the bread. If the bakery opens at 6:00 am and it takes 4 hours to prep then the latest the head baker can show up is 6 - 4 = 2:00 am. So, the answer is 2.