The cars travel with constant speed, and the equations of movement of each one are,
\(x_1=v_1t\)
\(x_2=x_0-v_2t\)
Where v_1=16 Km/h, v_2 is unknown, x_0 is 300 kilomters. As they meet in 2 hours, then t=2 and x_1=x_2, so,
\(x=v_1t\)
\(x=x_0-v_2t\)
Solving for v_2,
\(v_2=x_0/t-v_1=134\ \ Km/h\)