Question

Math question down below

Answer 1

You need to divide the - 4/5 by 3 to get the depth after 1 minute;
To do this you flip the second fraction (3/1) around and you multiply:
3/1 = 1/3

- 4*1/5*3 = - 4/15

This means he went - 4/15 miles down,
Hope this helps! :)