math
posted by susan on .
lily left house at 11.43 am and travelled to town, a distance of 31km. She arrived there at 12.09pm. What was the average speed in km/h and m/s.[ans:71.54 km/h & 19.87 m/s]
my answer is
~31/1.1=28.18 km/h
~31000/3960=7.83 m/s
can some1 show me the calculation if im wrong.

6043+9 = 26 min
26/60 = .433333 hr
26*60 = 1560 seconds
31 km/.433333 hr = 71.54 km/hr
31000m/1560 s = 19.87 m/s