Question 882663
Her time going from home down the street is:
{{{ t = 3/4 }}} hr
The round-trip time is :
{{{ 1 + 1/4 = 5/4 }}} hr
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So, her time returning home is:
{{{ 5/4 - 3/4 = 1/2 }}} hr
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Returning home:
{{{ 3 = s*(1/2) }}}
{{{ s = 3/(1/2) }}}
{{{ s = 6 }}}
Her speed returning home is 6 km/hr