It takes Elevator A 16 seconds and Elevator B 12 seconds to reach ground level at this time.
To find the time it takes for each elevator to reach ground level, we set the height h to 0 and solve for time.
For Elevator A:
Time_A =0.8h+16
Time_A =0.8(0)+16
Time_A =16 seconds
For Elevator B:
Time_B =−0.8h+12
Time_B =−0.8(0)+12
Time_B =12 seconds
Therefore, it takes Elevator A 16 seconds and Elevator B 12 seconds to reach ground level at this time.
Question
A building has two elevators that both go above and below ground. At a certain time of day the travel time it takes elevator A to reach height h in meters is 0.8h+16. The travel time it takes elevator B to reach height h in meters is -0.8h+12 seconds. How long would it take each elevator to reach ground level at this time?