Question 912789
Think of this as one biker standing still and
the other traveling at the sum of their speeds
Let {{{ s }}} = the speed of the slower biker in mi/hr
{{{ 2s }}} = the speed of the faster biker in mi/hr
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{{{ 210 = ( s + 2s )*5 }}}
{{{ 210 = 3s*5 }}}
{{{ 210 = 15s }}}
{{{ s = 14 }}}
and
{{{ 2s = 28 }}}
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Their speeds are 14 mi/hr and 28 mi/hr
check:
{{{ d[1] = 14*5 }}}
{{{ d[1] = 70 }}}
and
{{{ d[2] = 28*5 }}}
{{{ d[2] = 140 }}}
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{{{ d[1] + d[2] = 70 + 140 }}}
{{{ d[1]m + d[2] = 210 }}}
OK