If the radius of each tire on maria’s car is 0.30 meter, what is the approximate speed of maria’s car, to the nearest kilometer per hour, when the instrument is showing 779 revolutions per minute? (1 kilometer =1000 meters)

Step 1

Find the circumference of the tire

For r=0.30 m

Substitute

Step 2

Find the approximate speed of Maria’s car

we know that

1 revolution of the tire is equal to the circumference

so

1 revolution is equal to 1.88 meter

then

779 revolutions per minute is equal to------>

convert to Km per hour

we know that

1 meter is equal to -------> 0.001 km

1 minute is equal to (1/60) hours

substitute

therefore

the answer is

b

step-by-step explanation:

the word superfluous means unnecessary