Question 760889
Think of one driver as standing still and
the other one moving at the sum of their speeds
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Let {{{ s }}} = Joshua's speed in mi/hr
{{{ s + 5 }}} = George's speed in mi/hr
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{{{ 210 = ( s + s + 5 )*2 }}}
{{{ 210 = ( 2s + 5 )*2 }}}
{{{ 210 = 4s + 10 }}}
{{{ 4s = 200 }}}
{{{ s = 50 }}}
{{{ s + 5 = 55 }}}
 Joshua's speed is 50 mi/hr
George's speed is 55 mi/hr
check:
Joshua's equation:
{{{ d[1] = 50*2 }}}
{{{ d[1] = 100 }}} mi
George's equation:
{{{ d[2] = 55*2 }}}
{{{ d[2] = 110 }}}
{{{ d[1] + d[2] = 100 + 110 }}}
{{{ d[1] + d[2] =210 }}}
OK