Question 1103277
Rate x Time = Output
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{{{R[M]*5=1}}}
{{{R[M]=1/5}}}
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Together,
{{{(R[M]+R[B])*(7/2)=1}}}
{{{R[M]+R[B]=2/7}}}
Substituting from above,
{{{R[B]=2/7-1/5}}}
{{{R[B]=10/35-7/35}}}
{{{R[B]=3/35}}}
So,
{{{R[B]*t[B]=1}}}
{{{(3/35)*t[B]=1}}}
{{{t[B]=35/3}}}
{{{t[B]=11&2/3}}}
11 hours 40 minutes