Question

please tell answer I can't understand it

Answer 1

Given:
Distance moved down by submarine per minute = -20 m
                                                { If it is in minus then the boat moves downwards}
Distance moved down by submarine after 7 minutes = 7 * (-20)
                                                                          = -140 m

So, the submarine went 140 meters downwards.

Hope this helpz :)

Answer 2

Hey guy your answer
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Consider water level as 0 and it goes -20m means 20m below water level per minute so how much it will travel in 7 minutes hope this will help you