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Question
The following is the time-distance graph of Sneha’s walking.
- When does Sneha make the least progress? Explain your reasoning.
- Find her average speed in km/hour.
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Solution
a. Sneha made least progress between 25 min to 40 min.
Observing the graph carefully, we see that initially, she is travelling approximately 0.5 km in 10 min, 0.25 km in 5 min, till the first 25 min. But after 25 min, her speed decreased as she travelled 0.25 km in 15 min (between 25 min to 40 min).
b. Average speed = `"Total distance travelled"/"Time"`
= `2/(55/60)`
= `2/55 xx 60`
= 2.18 km/h
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