24 divided by 7872

PLEASE HELP

Somone me i want to know what 18 hours out of 24 hours in a fraction

Talia took the bus from her home to the bank and then walked back to her home along the same route. the bus traveled at an average speed of 40 km/h and she walked at an average speed of 5 km/h. to determine the time, x, that it took talia to walk home, she used the equation 40(0.9 – x) = 5x. the time of trip 2 is hours. the distance of trip 1 is km.

Consider the linear function that is represented by the equation y= 4x+5