Final answer:
To calculate the new time it takes Albert to drive home at 100 km/hr, we first determine the distance using his original speed and time. The distance is 100 km, and at the new speed of 100 km/hr, it will take him 60 minutes to get home.
Step-by-step explanation:
If Albert takes 75 minutes to drive home at 80 km/hr, we first need to calculate the distance to his home. Speed (velocity) is distance divided by time, so the distance can be found by multiplying the speed by the time. Therefore, the distance is 80 km/hr × 1.25 hr (since 75 minutes is 1.25 hours), which equals 100 km. Now, to find out how long it will take him to drive home at 100 km/hr, we divide the distance by the new speed, which is 100 km ÷ 100 km/hr, resulting in 1 hour. Hence, at the increased speed of 100 km/hr, it will take Albert 60 minutes to drive home.