Alberto and Bianca run a 50 km race. The illustration below shows the graph of the position of the two runners as a function of time.
Complete the following sentences based on the graph of the function.

•Early in the race, ___(choose between Alberto, Bianca and nobody) runs faster.

•Alberto maintains a speed of _km/h during the first hour of the race.

•However, after one hour he gets tired and must take a break. Unfortunately, he falls asleep!

•Meanwhile, Bianca's running speed ___(choose between keeps increasing, keeps decreasing, or stays constant)

• The first person to cross the finish line is ___(choose between Alberto, Bianca or nobody)