The speed of traffic flow on a certain highway between 6 A.M. and 10 A.M. on a typical weekday is approximated by the functon 
where 
is measured in miles per hour and t is measured in hours, with 
corresponding to 6 A.M. Find the interval where f is increasing, the interval where f is decreasing, and the relative extrema of f. Interpret your results.
Definitions:
Detrusor Muscle
The smooth muscle found in the wall of the bladder, which contracts during urination to expel urine.
Micturition
Micturition is the biological process of discharging urine from the bladder through the urethra to the outside of the body, commonly referred to as urination.
Urinary Bladder
A muscular sac in the pelvic cavity that stores urine before it is excreted from the body.
Ureters
Tubes that carry urine from the kidneys to the bladder, essential for the transportation of urine in the urinary system.
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