<PRE><B>Question 1218</B>
 Sol: (A) If the distance between home and the site is D miles.
         The walking speed was D/9 miles/hr and the jogging speed was D/3 miles/hr.
         Since the difference of the speed is 4 miles/hr, we have
           D/3 = 4 + D/9, 
         Or 3D = 36 + D, or 2D = 36, so D = 18 miles.
     (B) If the daily driving distance to town site is x miles.
         On Monday,he spent x/60 hrs and on Monday,he spent x/40 hrs in driving to town.
         Since the total travelling time was15 hrs, we get
         x/60 + x/40 = 15,
         Multiplying by 120 on both side: 2x + 3x = 1800,
         Or 5x = 1800, x = 360 miles</PRE>