Answer to Problem # 7: 7 ½ in. x 1800 feet = sec. x 1800 feet sec. 7 ½ in. sec. x 1800 ft. x min. x hour x 12 in. 7 ½ in. 60 sec. 60 min. ft. 1 x 1 x hr. x 1800 x 12 = 2 x hr. x 1800 x 12 7 ½ 60 60 15 60 60 = 4/5 hour (ANSWER)
To convert to normal time dimensions … 4 x hr. x 60 min. = 4 x 12 min. = 48 minutes (ANSWER) 5 hr. return