Question 492877
Average speed is always ( total distance ) / ( total time )
Is is NOT the average of 2 averages, so
{{{ d[1] = 24*3 }}}
{{{ d[1] = 72 }}} mi
------------
{{{ d[2] = 40*5 }}}
{{{ d[2] = 200 }}} mi
------------
The average speed is
{{{ ( 72 + 200 ) / ( 3 + 5 ) }}}
{{{ 272 / 8  = 34 }}}
His average speed is 34 mi/hr
------------------------
Note that the average of the averages is
{{{ ( 24 + 40 ) / 2 = 32 }}} and this is wrong