Answer: 20 miles
Explanation:
As per given,
Route1 = directly from Banesville to Tempe
Distance = 40 miles
Distance covered in whole journey from Banesville to Tempe and back = 2(40)= 80 miles
Route 2= Banesville to Tempe through Georgetown
Distance = 30+20 = 50 miles
Distance covered in entire journey (Banesville to Tempe and back) = 2(50) = 100 miles
Distance saved = 100 miles - 80 miles = 20 miles
Hence, he saved 20 miles.