Answer: 50 seconds
Explanation:
From the question, we are informed that Clare is paid $90 for 18,000 seconds of work. This means that for Clare to get $1, she'll work for (18000/90) = 200 seconds. From the calculation $1 = 200 seconds
We should note that 100 cents = $1, therefore 25 cents = 25/100 = $0.25.
The seconds that it will take for her to earn 25 cents will be:
= 200 × 0.25
= 50 seconds
Therefore, it'll take 50 seconds for her to earn 25 cent.