Question 870541
Average speed is always ( total distance ) / ( total time )
Total distance = {{{ 2*23 = 46 }}} mi
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{{{ t[1] = 23 / 40 }}}
{{{ t[2] = 23 / 60 }}}
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{{{ t[1] + t[2] = 23/40 + 23/60 }}}
{{{ t[1] + t[2] = 23*( 1/40 + 1/60 ) }}}
{{{ t[1] + t[2] = 23*( 3/120 + 2/120 ) }}}
{{{ t[1] + t[2] = 23*( 5/120 ) }}} hrs
( total distance ) / ( total time ) = {{{ 46 / ( 23*( 1/24 ) ) }}}
( total distance ) / ( total time ) = {{{ 24*2 }}}
( total distance ) / ( total time ) = {{{ 48 }}} mi/hr