Answer:
Additional amount of clearance between the truck and overpass is 16.8 inches.
Explanation:
A law states that a a freight truck must have the clearance of at least 3 feet to travel under the a overpass.
Sign on an overpass states that the overpass is 18 feet above the road's surface.
Height of the truck is 13.6 feet.
As per rule height of overpass from the road must be height of the truck + clearance.
Additional amount of clearance between the truck and the overpass
= Distance between the road and the overpass - (height of the truck + clearance)
= 18 - (13.6 + 3)
= 18 - 16.6
= 1.4 feet
Since 1.4 feet = 12 inches
1.4 feet = 12×1.4 = 16.8 inches
Therefore, additional amount of clearance between the truck and overpass is 16.8 inches.