Maths, Addmaths and Statistics: Post your doubts here!

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Ok so this question is tough.

Speed of sparrow is x km/h in STILL air.

When wind is blowing at 1 KM/H, sparrow takes 5 hours to fly 12 km to nest and 12 km back again. She goes out directly into win and returns with wind behind her. Find Normal speed.
 
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can anybody please explain questions related to upperbond and lowerbond
We always use this in finding the area of a graph. (UPPERBOUND - LOWERBOUND)
For example in this graph,
Screenshot_20170528-143148.png
We will find the area by subtracting the blue curve from the red curve.
This is also used when a line intersects the graph at more than two points.
Hope this answers your question.
 
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