Susan can run 2 city blocks per minute. She wants to run 60 blocks. How long will it take her to finish if she already ran 18 blocks

Question

Math is very hard for me to understand

Answer 1

We can set a proportion.

 

2 blocks = 1 minute

 

18 blocks = 9 minutes

 

60 blocks = 30 minutes

 

 

She already ran for 9 minutes.  She needs to run 42 more blocks.

 

If we subtract 9 minutes from 30 minutes, we get 21 minutes.  Therefore, she needs to run 21 more minutes.

 

To verify this, we check the proportionality.

 

2 blocks = 1 minute

 

42 blocks = 21 minutes

 

42 blocks / 21 minutes = 2 blocks per minute