Respuesta :
Answer:
9km
1hr
x
1000m
1km
x
1hr
60min
x
1min
60s
9km/1hr x 1000m/1km x 1hr/60min x 1min/60s = 2.5 m/s
If the conversion factors are properly set up and all numbers are correct, the unwanted units cancel out leaving the units of the final answer.