Homework Help: math

Posted by susan on Friday, July 22, 2011 at 7:35pm.

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.

math - Damon, Friday, July 22, 2011 at 7:47pm
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

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