A truck goes from Haryana to Bangalore with an average speed of 60 km/h. The journey takes 30 hours. It returns from Bangalore to Haryana on the same road with an average speed of 40 km/h. What was the average speed of the truck during the roundtrip?
Answer & explanation
Correct answer: option 4
Average speed = \(\frac{2 × S1 × S2 }{S1 + S2}\)
= \(\frac{2 × 60 × 40 }{60 + 40}\)
= \(\frac{4800 }{100}\)
= 48 km/h