An aircraft burns 12 gallons of fuel per hour. A planned flight lasts 3 hours 15 minutes, and the pilot must also carry a 45-minute fuel reserve. What is the minimum amount of fuel needed?
Show answer & explanation
Answer: C
39 gallons: This covers the 3.25-hour flight only (3.25 x 12) and leaves out the 45-minute reserve.
43.2 gallons: This treats 3:15 + 0:45 as 3.6 hours by reading minutes as decimals. The two times actually add to 4 hours.
48 gallons: Correct. 3 h 15 min + 45 min = 4 hours, and 4 x 12 = 48 gallons.
54 gallons: This uses 4.5 hours, which overstates the total time by 30 minutes.
Convert minutes to fractions of an hour (15 min = 0.25 h, 45 min = 0.75 h) before multiplying by a per-hour rate.