\magnification=\magstep2


$$
t = m x + b
$$

$$ 
t = { {1} \over {0.4} } x + b
$$

$$ 
t = { {1} \over {0.4} } x + (25{\rm\ ns})
$$

$$
x = p t + q
$$

$$ 
x = 0.4 t + q
$$

$$
x  = 0.4 t - (10{\rm \ ns})
$$


\bye
