Question:
The following is the distance-time graph of amit's walking.
Study the above graph carefully and answer the questions given below:
(i) When does Amit make the least progress? Explain your answer.
(ii) Find his average speed in km/hr.
Solution:
(i) Amit make least progress from 25 min to 40 min, as indicated by the line in the graph.
(ii) Total distance covered = 2km
Total time $=55 \mathrm{~min}=\frac{55}{60} \mathrm{hr}$
Average speed $=\frac{\text { Total } \text { distance covered }}{\text { Total time }}=\frac{2}{55} \times 60=2.18 \mathrm{~km} / \mathrm{hr}$