A man covers the first half of the journey at the speed of 60 km/h and the remaining at the speed of 84 km/h. What is his average speed (in km/h)?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 70.
Average speed = (2 × 60 × 84)/(60 + 84)
⇒ (2 × 60 × 84)/144 = 70 km/h