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]

Question

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.

Damon · Answer

60-43+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