Question

A 10 foot rope ladder hangs over the side of a boat with the bottom rung on the surface of the water. The rungs are one foot apart, and the tide goes up at the rate of 6 inches per hour. How long will it be until three rungs are covered?(Never. The boat rises as the tide goes up.)

Answer 1

1 foot = 12 inch

distance between three lungs = 3foot = 36inches

tide goes 6 inches up in 1 hour so it will take 6 hours to go 36 inches up.