A school bus takes 20 minutes to reach school from your house. if the average velocity of the bus is 15.0 km/h to the west, the displacement from your house is:

Here,

initial velocity=0

final velocity=15km/h

=15000m/3600s

=4.166666 ... m/s

time=20 min or 1200 sec

Now, acceleration = (v-u) / t

=4.1666 ... / 1200

=0.00347222 ... ms^-2

So, displacement=ut+0.5at^2

=0+0.5*0.00334722 ... * 1200^2

=2500 m or 2.5 km