Chemistry conversion problem...need help?

1 yard is = 36 in x 2.54 cm/in /100cm/meter or 0.9144 meters/yard. Therefore 100 meters/0.9144 meters/yard=109.36 yards. At the same rate of 100 yards per 9.3 seconds or 10.752 yards per second it would take 109.36yards per 100 meter/ 10.752 yards per second or 10.17 seconds to run 100 meters. Speed would be 100meters/10.17 seconds or 9.83 meters/second. How long would it take to run 1.45 km? = 1450 meters /9.83 meters second=147.5 seconds or 2 minutes 27.5 seconds.