Register
Whe she was in year 8, sarah could run 800 metres in 3 minutes and 20 seconds. Three years later, when she was in year 11, she could run 800 metres in 2 minutes and 44 seconds. Find the percentage improvement
235k views
3 votes
Whe she was in year 8, sarah could run 800 metres in 3 minutes and 20 seconds. Three years later, when she was in year 11, she could run 800 metres in 2 minutes and 44 seconds. Find the percentage improvement in her time.

User Jacobra
by
8.3k points

1 Answer

4 votes
Info u have

8yr : 3min 20s=60s * 3 + 20s = 180s + 20s = 200s
11yr : 2min 44s = 60s * 2 + 44s = 120s + 44s = 164s

Counting:

200s - 164s = 36s

36s 18
——- = ——- = 18%
200s. 100

Check:

200s * (100% - 18%) = 164s
User LuckyLikey
by
7.9k points
Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.5m questions

12.2m answers

Other Questions

How do you can you solve this problem 37 + y = 87; y =
What is .725 as a fraction
i have a field 60m long and 110 wide going to be paved i ordered 660000000cm cubed of cement  how thick must the cement be to cover field
Write words to match the expression. 24- ( 6+3)
A dealer sells a certain type of chair and a table for $40. He also sells the same sort of table and a desk for $83 or a chair and a desk for $77. Find the price of a chair, table, and of a desk.
Link Copied!