The question should have said "..flying
level...", That is at 1g. Lift is constant and is made up of CL and V squared,
so if V has gone up to 1.3 times its Vs1g value then lift has gone up
1.3squared. CL then has to go down 1.3squared to compensate. 1.3squared is 1.69
and 1/1.69 (to get the final result) is 0.591 of the original value. The faster
you go, the lower goes the nose.