Aman goes from A to B at a speed of 40 km/h. Using the same route, he comes back from B to A, at a speed of 55 km/h. What is his approximate average speed for the whole journey?

47.5 km/h 48.11 km/h 46.32 km/h 46.24 km/h

46.32 km/h

Average speed  = \(\frac{2 ×S1 × S2}{S1 + S2}\)  = \(\frac{2 × 40  × 55  }{40 + 55 }\) = 46.2157  km/h = 46.32 km/h ( approx)