the speed of 90 hm/hr is equal to....

m/s

What kind of length unit is "hm"?

25m/s

To convert a speed from hm/hr (hectometers per hour) to m/s (meters per second), you need to use the following conversion factors:

1 hectometer (hm) = 100 meters (m)
1 hour (hr) = 3600 seconds (s)

Now let's perform the conversion:

Speed in hm/hr = 90 hm/hr

To convert hm to m, multiply by 100:
90 hm/hr * 100 m/hm = 9000 m/hr

To convert hr to s, multiply by 3600:
9000 m/hr * 3600 s/hr = 32400000 m/s

Therefore, the speed of 90 hm/hr is equal to 32400000 m/s.