1) d=rt   d= .5 (50)
           d=25miles


2) d=rt   d= 1756mph * 1.7 hours
             d= 2985.2miles


3) d=rt    500=80 t
           500/80 = t
            t= 6.25h


4) d=rt      1200=60 * t
             1200/60 = t
             t=20