Question

a treasure chest sinks at a rate no less then 20 feet per second. the floor of the ocean is at most at -4,200 feet. will the treasure chest reach the ocean floor in less than 3 minutes ?

Answer 1

no because it will reach 3,600 feet.
60 x 3 = 180
180 x 20 = 3,600

Answer 2

We know that their is 60 seconds in a minute so we need to make 3 mins into seconds. 60x3=180. If it falls 20 ft/sec then we can do 20x180 and see if it is more or less than 4,200. 20x180 is 3,600 so, No it will not reach it in less than 3 mins.