A car covers a certain distance travelling at a speed of 60 km/h and returns to the starting point at a speed of 40 km/h. The average speed of the car for the entire journey is:
Answer & explanation
Correct answer: option 2
We know ,
Average speed = \(\frac{2 × S1 ×S2 }{S1 + S2}\)
According to question ,
Average speed = \(\frac{2 × 60 × 40 }{60 + 40}\)
= 48 km/h