)a bus travels 400 km in 4.5 hours. (5 total)
a. let the variable v be the speed of the bus. give an equation for v. (2)
400km is the speed of the bus so you have to
b. use your calculator to find v as a decimal. include the unit. (3; 1 point for unit labeled)

We have the distance: d = 400 km and we have the time: t = 4.5 hours.
The formula for the speed ( the velocity ) is:
v = d / t  ( distance/time )
So v = 400 km / 4.5 h
v = 88.89 km/h
The SI unit is m/s.
If we want to transform km/h to m/s we have to divide this result by 3.6:
88.89 km/h : 3.6 = 24.69 m/s
The speed of the bus is 88.89 km/h or 24.69 m/s.