A submarine begins its descent from the surface of the water. It dives 20 meters each minute for several minutes. If the submarine reaches a depth of 360 meters below sea level, how much time did the dive take?

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Answer 1 · 2018-03-07T06:07:45

18 mins.

Time taken to travel 20 m = 1 min
Time taken to travel 360m = #x# min

therefore:

#1/20 = x/360 #
(cross multiply)

20 #x#=360
(isolate #x# by dividing both sides by 20)

#x# = #360/20#

#x# = 18 mins.