Answer:
168 in/sec
Explanation:
It helps if you forget the /sec for a second. You end up having to solve what is 14 feet in inches which seems a LOT less complicated:
1 ft = 12 in
14 ft
14 * 12 = 168
Multiply the amount of feet you have by 12 (12 inches in a foot) and you have your answer.
FUN FACT:
If you wanted to go from inches to feet, all you have to do is work backwards. Divide by 12 and you'll get your feet.
EX:
168 in/sec = ? ft/sec
168/ 12 = 14