Question

Help please!!
what do i do??

Answer 1

42s

Explanation:

assume it's a pyramid as the photo show

calculate the large pynamid and then minus the small pynamid to get the volume of the bowl

small is similar to large

volume of small : volume of large = 4³ : 8³ = 1 : 8

to find the height of large pynamid

length of small : large = 4:8 = 1:2

so height of large of pynamid = 10in

height of small= 5in

the volume of the small pynamid = 5*4*3/2

=30 in³

volume of large : 30 = 8:1

volume of large = 240 in³

volume of the bowl= 240-30

=210 in³

then let's calculate the time needed

time= 210/5

=42 s

Answer 2

18 seconds ---- see below

Explanation:

Find the area of the trapezoid front

5 x (8+4)/2 = 30 in^2

Multiply this area by the depth (into the page) of 3 inches to get the volume

30 in^2 * 3 in = 90 in ^3

Now calculate the time

90 in^3 / (5 in^3 /sec) = 18 seconds