Four fifths of the total number of students take the school bus to school.
a. what percent of the total number of students do not take the school bus to school?
b. what is the ratio of students who take the school bus to those who do not?
for the !

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m