The walking speed of Helen is as similar to the graph below. Then, the speed of Helen is .

1 mph

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2 mph

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3 mph

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4 mph

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Solution

The correct option is B 2 mph
Take one co-ordinate (2,4) from the graph.
slope= $\frac{v e r t i c a l c h a n g e}{h o r i z o n t a l c h a n g e}$
= $\frac{4}{2}$
= 2 mph
Here, slope is nothing but walking speed of Helen = 2 mph

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