Julius has a garden that has dimensions of 12 ft by 20 ft. Julius needs more room to plant some peppers, and determines the garden will need a new area of 360 square feet. How much should he increase the length and width by, if he wants to increase them by the same amount? Round your answer to the nearest tenth.
A. 3.8 feet
B. 3.6 feet
C. 3.4 feet
D. 35.4 feet