A borewell machine drills down 72 feet per hour from surface of the ea

1.	A borewell machine drills down 72 feet per hour from surface of the earth. If the water is at 360 feet down from surface of earth, after how many hours it will touch the water layer?
Answer» Depth of drilling in one hour = – 72 feet Depth of water layer from surface of earth = – 360 feet Number of hours required = – 360 ÷ (-72) = 5 Hence, the borewell machine will touch water layer at 5 hours of drilling.

A borewell machine drills down 72 feet per hour from surface of the earth. If the water is at 360 feet down from surface of earth, after how many hours it will touch the water layer?

Answer»

Depth of drilling in one hour = – 72 feet

Depth of water layer from surface of earth = – 360 feet

Number of hours required = – 360 ÷ (-72) = 5

Hence, the borewell machine will touch water layer at 5 hours of drilling.