Question

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

Answer 1

She needs to run 21 more minutes.

Explanation:

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.

Answer 2

It would take 21 minutes to run the 42 blocks remaining

Explanation:

If Susan can run 2 city blocks per minute and she already ran 18 blocks of the 60, it means that she has to run 60 minus 18 blocks: that is 42 blocks in total. at a rate of 2 per minute it would take her 42 over that same rate: that's
`(42)/(2) = 21` minutes in total.