Question 1078581
You can think of this as one of the cars standing
still and the other one traveling at the sum of their speeds
Let {{{ s }}} = the speed of the slower car
{{{ s + 6 }}} = the speed of the faster car
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{{{ 656 = ( s + s + 6 )*4 }}}
{{{ 656 = ( 2s + 6 )*4 }}}
{{{ 656 = 8s + 24 }}}
{{{ 8s = 632 }}}
{{{ s = 79 }}}
and
{{{ s + 6 = 85 }}}
The speeds of the 2 cars are:
79 mi/hr and 85 mi/hr
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check:
{{{ d[1] = 79*4 }}}
{{{ d[1] = 316 }}} mi
and
{{{ d[2] = 85*4 }}}
{{{ d[2] = 340 }}} mi
and
{{{ d[1] + d[2] = 316 + 340 }}}
{{{ d[1] + d[2] = 656 }}} mi
OK