Judging that you are giving a 200m time, I would assume that you are a sprinter. This means that your second 200 will most likely be slower than your first so you should run around 50-51sec for your 400.
They would not finish 300 metre because they would have an asthama attack.
51.62 seconds.
Any time under 40 seconds is a good time for the 300 Meter Intermediate Hurdles for high school boys.
Assuming you don't run any faster in the 300m. 3/4x (time run)=300m time
500 x 300 = 1500 square meters
1,000 meter = 1 kilometer 300 meter = 0.3 kilometer
11.184 681 46 mile/hour (mph) this is the site I used: http://www.onlineconversion.com/speed_common.htm
91.44 meter
300 square feet equates to about 28 (27.8709) square meters.
1 meter = 100 centimeters 300 would be more.
Depends on the level of runner. The world record is held by Michael Johnson at 30.85 seconds. He also holds the 400m world record 43.18 seconds.
300 millimetres is 30 centimetres which is about the length of a ruler.