Question

The submarine started 20 feet below the surface of the water and now is 10 feet below the surface .What is the change in the depth

Answer 1

Answer:

18 mins.

Step-by-step explanation:

Time taken to travel 20 m = 1 min

Time taken to travel 360m = x min

therefore:

$\frac{1}{20} = \frac{x}{360}$

(cross multiply)

20 x=360

(isolate x by dividing both sides by 20)

$x = \frac{360}{20}$

x = 18 mins.