Question

3) A submarine is at sea level. At 8.00p.m. it
begins to descend at a rate of 8 m per
minute. At what time will it be at -240 m?
Please answer me quickly with explanation

Answer 1

Answer:

8:30p.m

Step-by-step explanation:

time when submarine begin to descend=8:00p.m

rate of descending per minute=8m

time when submarine reaches 240m=?=x

1min=8m

xmin=240m

by cross multiplication,

x=240m/8m

=30min.

So,time when submarine reaches 240m(here -sign indicates descending)=8:00+30min

=8:30p.m