Question 736465
The time for the 1st portion was {{{ 45/r }}}
The time for the 2nd portion was {{{ 45/(( 3/4)*r) = 60/r }}}
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{{{ 1.75 = 45/r + 60/r }}}
{{{ 1.75r = 45 + 60 }}}
{{{ 1.75r = 105 }}}
{{{ r = 60 }}}
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Ave speed for 1st part: {{{ r = 60 }}} mi/hr
Ave speed for 2nd part: {{{ (3/4)*r = 45 }}} mi/hr