Question 778228
The cars are separating at the sum of their speeds
Let {{{ r }}} = the rate of the southbound car
I can say:
{{{ 345 = ( 50 + r )*3 }}}
{{{ 345 = 150 + 3r }}}
{{{ 3r = 195 }}}
{{{ r = 65 }}}
The southbound car is traveling at 65 mi/hr
check:
Northbound car:
{{{ d[1] = 50*3 }}}
{{{ d[1] = 150 }}}
Southbound car:
{{{ d[2] = 65*3 }}}
{{{ d[2] = 195 }}}
and
{{{ 150 + 195 = 345 }}}
OK