Remember that
1 mile=5,280 ft
so
1) Drives 5.2 miles -----> 5.2*5,280=27,456 ft
2) train 2.4 miles -----> convert to feet
2.4 mi=2.4*5,280=12,672 ft
3) walks 1,947 ft
therefore
Adds the numbers
27,456 ft+ 12,672 ft+1,947 ft=42,075 ft
therefore
the answer is option A