Strictly speaking there are no hurdles in a 400m race, but in a 400mH race there are ten hurdles per lane.
10 hurdles in the 110 M hurdles
There are ten hurdles in 100m, 110m and 400m hurdles races.
there are six hurdles in a 60m hurdles race.
There are 10 hurdles in the men's 400 metres hurdles.
There are ten (10) hurdles in the 110mHH
There are 10 evenly spaced hurdles.
For womens 100m hurdles there is 9 hurdles, and for mens 110m hurdles there is 10 hurdles.
In high school the 300mH (both genders) and 110mH (boys) or 100mH (girls). At the Collegiate level and beyond, the 110mH and 100mH are still run, but the long hurdles distance increases to 400mH.
There are ten (10) hurdles.