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Look at the question above.please help me on 3a and 3b

Look at the question above.please help me on 3a and 3b-example-1
User Inderpal
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1 Answer

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on 3a- its asking you to find out how fast the lava is flowing and simplifying it so much that the denominator is one. If its 0.9 in 3 seconds, how much is it in 1 second.
I'm not sure about 3b- what does (l,r) mean?
Hope this helped
User Dhaval Panchal
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