Thus if d,/ is the increase of 4, due to a displacement from P to P', and k is the component of velocity normal to PP', the flow across PP' is d4 = k.PP'; and taking PP' parallel to Ox, d,, = vdx; and similarly d/ ' = -udy with PP' parallel to Oy; and generally d4,/ds is the velocity across ds, in a direction turned through a right angle forward, against the clock.
But this time I 'd been racing against the clock.
Race against the clock in this fun challenge called Cone Crazy 2.
You don't get your choice of skin, but in a race against the clock you don't want to be bothered with some pattern and color combinations.
Just like the standard board game except you race against the clock to remove body parts.