{HEAD ~ The fixed distance} divided by the transit time is equivalent to {TAIL ~ the average velocity} of the ball over the fixed distance 
is equivalent to
{ HEAD ~ The fixed distance } divided by the transit time is equivalent to { TAIL ~ the average velocity } of the ball over the fixed distance
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH