Question 7660
First, convert 90 mph to feet per second (fps).

{{{(90 mph)*(5280 ft/mi)/(3600 secs/hr)= 132 fps}}}

The baseball travels at 132 fps.  How long does it take to travel 60.5 ft.?

{{{(60.5ft)/132fps = 0.4583secs}}} to reach home plate.

Now convert 132 fps into inches per second (ips).

{{{(132fps)*(12inches/ft) = (1584ips)}}}

At a speed of 1584 ips, how long does it take the baseball to travel 17 inches?

{{{(17inches)/(1584 ips) = 0.0107secs}}} to cross the strike zone.