int main() { st.eat(); scanf( "%lf", &vp ); cur.eat(); scanf( "%lf%lf", &v, &r ); R = st.mag(); o = vp / R; s = ang( st ); t = ang( cur ); Q = t - s; while ( Q < -EPS ) Q += 2 * PI; double up = 1e9, lo = 0; while ( up > lo + 1e-10 ) { double mid = (up + lo) / 2.0; double ang = s + o * mid; P p = P( R * cos(ang), R * sin(ang) ); double d = dist( p, cur ); if ( d < mid * v + EPS ) { up = mid; } else { lo = mid; } } printf( "%.9f\n", up); return 0; }