Question 1095725
Let {{{ s }}} = the speed of the other car
Think of this as one of the cars standing
still and the other moving at the sum
of their speeds
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{{{ 600 = ( 70 + s )*5 }}}
{{{ 600 = 350 + 5s }}}
{{{ 5s = 250 }}}
{{{ s = 50 }}}
The average speed of the other car is 50 mi/hr
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check:
{{{ d[1] = 70*5 }}}
{{{ d[1] = 350 }}}
and
{{{ d[2] = 50*5 }}}
{{{ d[2] = 250 }}}
and
{{{ d[1] + d[2] = 350 + 250 }}}
{{{ d[1] + d[2] = 600 }}}
OK