Ruksana travelled at 60 km/h while going from point A to point B, and returned via the same route at a different speed. If Ruksana’s overall average speed during the two-way journey was 48 km/h, what was her speed while travelling from B to A?

40 km/h

Average speed = \(\frac{2 × S1 × S2 }{S1 + S2}\)

48 = \(\frac{2 × 60 × S2 }{60 + S2}\)

5 × S2 = 120 + 2 ×S2

3 ×S2 = 120

S2 = 40

So Desired speed is 40 km/h