They would not finish 300 metre because they would have an asthama attack.
Any time under 40 seconds is a good time for the 300 Meter Intermediate Hurdles for high school boys.
51.62 seconds.
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
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.
1 meter = 100 centimeters 300 would be more.
300 square feet equates to about 28 (27.8709) square meters.
91.44 meter
300 millimetres is 30 centimetres which is about the length of a ruler.