If a car moves from Jaipur to Delhi at a speed of 60 km/hr and comes back from Delhi to Jaipur at a…

For equal distances covered at speeds $v_1 = 60\text{ km/hr}$ and $v_2 = 40\text{ km/hr}$, the average speed is the harmonic mean: $\frac{2 v_1 v_2}{v_1 + v_2} = \frac{2 \times 60 \times 40}{60 + 40} = \frac{4800}{100} = 48\text{ km/hr}$.