Question 363481
{{{230/A = 330/(A+20)}}},
{{{230(A+20) = 330A}}},
{{{230A + 4600 = 330A}}},
{{{4600 = 100A}}},
A = 46 mi/hr, the speed of train A,
A + 20 = 66 mi/hr, the speed of train B.