Dave spent 21 minutes completing a race. He walked 9 minutes and jogged the rest. What is the ratio of time he jogged to time he walked?

i can

step-by-step explanation:

for this case we have that by definition, the surface area of a cylinder is given by:

where:

r: it is the radius of the cylinder

h: it is the height of the cylinder

we can also rewrite it as:

where:

la: it's the lateral area

ba: area of the base

option a