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 has already run 18 blocks?

Answer 1

$60 \times 2 = 120$
$18 \times 2 = 36$
$120 - 36 = 84$
Your answer is 84 mins

Answer 2

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

Hope this helps!