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?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 48 km/h
Formula used
The average speed = 2 × x × y/(x + y)
Where, x = the speed of truck from Haryana to Bangalore
y = the speed of truck from Bangalore to Haryana
Given x = 60 km/h
y = 40 km/h
The average speed = (2 × 60 × 40)/(60 + 40)
= 48 km/h