Question 1052771
I'm not sure what the question is, but I
assume you want to know Jill's speed 
{{{ d = r*t }}}
{{{ r = d/t }}}
{{{ r = ( 8 + 3/4 ) / ( 3 + 1/2 ) }}}
( note that 3 hrs 30 min = 3 + 1/2 hrs )
{{{ r = (35/4) / ( 7/2 ) }}}
{{{ r = (35/4) / (14/4) }}}
{{{ r = 35/14 }}}
{{{ r = 5/2 }}}
{{{ r = 2 + 1/2 }}}
Jill's speed is 2 and 1/2 units/hr
( miles/hr ? You didn't say what units for distance )