A man goes to Chennai from Hyderabad at a speed of 56km/hr and returns to Hyderabad at speed of 72km/hr, through same route. What is his average speed (in km/hr) of the entire journey?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 63.
Average speed = (2 × 56 × 72) / (56 + 72)
= (8064) / 128
= 63 km/h