<PRE><B>Question 943999</B>
Backtracking, she has 45 miles of road which she can cover using rate*time = distance,
50 * time = 45
Time = 45/50 = 9/10 of an hour
Now, instead of backtracking, she heads out over the sand
D^2 = 15^2 + 30^2
D^2 = 225 + 900 = 1125
D = square root (1125) = 33.54
30 * time = 33.54
Time = 33.54 / 30 = 1.12 hours
Backtracking along the road will get her back sooner</PRE>