Question 956593
You can think of this as one of them standing still
and the other moving at the sum of their speeds
{{{ 50 = ( 50 + 40 )*t }}}
{{{ 50 = 90t }}}
{{{ t = 5/9 }}} hrs
convert to minutes:
{{{ (5/9)*60 = (5/3)*20 }}}
{{{ (5/3)*20 = 100/3 }}}
They meet in 33.333 min
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check:
{{{ d[1] = 50t }}}
{{{ d[1] = 50*(5/9) }}}
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{{{ d[2] = 40t }}}
{{{ d[2] = 40*(5/9) }}}
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{{{ d[1] + d[2] = 50 }}}
{{{ 250/9 + 200/9 = 50 }}}
{{{ 250 + 200 = 9*50 }}}
{{{ 450 = 450 }}}
OK