Walking at a speed of 4 km/hr, Gayathri takes 45 minutes to reach home from the school. How far is the school from her home? (3 marks)

Solution:

Time taken for Gayathri to reach home from the school = 45 minutes = $\frac{3}{4}$ hr (1 mark)
Her speed = 4 km/hr, which means in one hour, she can cover 4 km. (0.5 marks)
So, the distance between her home and the school will be the distance she travels in 3/4 hr. (0.5 marks)
Thus, distance = 4 $\times$ $\frac{3}{4}$ = 3 km (1 mark)