Question 1122793
A’s rate:
{{{ 1/12 }}}
T’s rate:
{{{ 1/16 }}}
Add their rates of working to get
Their rate working together
{{{ 1/12 + 1/16 = 1/t }}}
{{{ 4/48 + 3/48 = 1/t }}}
Multiply both sides of {{{ 48t }}}
{{{ 4t + 3t = 48 }}}
{{{ 7t = 48 }}}
{{{ t = 6.857 }}}
It takes them 6.86 hrs working together