132 ft / sec. I believe this is the answer.
Answer: 
Step-by-step explanation:
The circular oil slick is expanding at a rate of 
Let A be the area of the circular oil slick,
So, the changes in A with respect to time (t),



Also, the change in diameter with respect to time(t),



For r = 1.5 m,
Answer:
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Step-by-step explanation:
Answer:
30 hours
Step-by-step explanation:
30+45x=60+45x
45x=30+45x
x=30