Question 770119
Think of one cyclist as standing still and the
other traveling at the sum of their speeds
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Let {{{ s }}} = Harry's speed in km/hr
{{{ 2s }}} = John's speed in km/hr
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{{{ 90 = ( s + 2s )*2 }}}
{{{ 3s = 45 }}}
{{{ s = 15 }}}
and
{{{ 2s = 30 }}}
Harry's speed is 15 km/hr
John's speed is 30 km/hr
check:
{{{ d[1] = 15*2 }}}
{{{ d[1] = 30 }}}
and
{{{ d[2] = 30*2 }}}
{{{ d[2] = 60 }}}
and
{{{ d[1] + d[2] = 30 + 60 }}}
{{{ d[1] + d[2] = 90 }}}
OK