Yihana is walking uphill exactly when the graph is increasing (that is, when the slope of the segment of the graph is positive).

This is between 0 and 3 minutes and between 8 and 10 minutes, which correspond to lengths of time of 3 minutes and 2 minutes in these two cases, for a total of 5 minutes.

ANSWER: (A)

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Yihana walks for 10 minutes. A graph of her elevation in metres versus time in minutes is shown. The length of time for which she was walking uphill is
(A) 5 minutes
(B) 6 minutes
(C) 4 minutes
(D) 7 minutes
(E) 8 minutes

![](https://cdn.mathpix.com/cropped/2024_04_20_e85ef69091c57cb633f3g-008.jpg?height=325&width=444&top_left_y=1434&top_left_x=1293)