Question

Help me out
A car travels 100km at speed 60km/hr and returns with speed 40km.Calcuate average speed

Answer 1

$\frac{60 + 40} {?2 } = 50$

Answer 2

$\frac{2uv}{u + v} \\ \frac{2 \times 40 \times 60}{100} \\ 48km {h}^{ - 1}$