Help with math/chemistry homework ..dimensional analysis?

Question

i have a few probs and im not sure if i did them right so could you plz help me solve these..plz include work to see how you did them thnxx

1)a cars distance in 112.6 km in 1.8 hrs how much is that in meters per second

2)convert 55 miles per hour to kilometer per hour

3)How many kilometer per second is 55 miles per hour ( 1 mile =1.6 kilometer)

Answer 1

1. 112.6x1000 = 112,600m

1.8h x 60m x 60s =6480 seconds

112,600 meters in 6480 seconds

17.38m/s

2. 55x1.6 = 88km/h

3. 88km/h divided by 60 minutes/hour divided by 60 seconds/minute = 0.024 km/s