A man goes to Chennai from Hyderabad at a speed of 24km/hr and returns to Hyderabad at speed of 40km/hr, through same route. What is his average speed (in km/hr) of the entire journey?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 30.
Speed going = 24 km/hr
Speed returning = 40 km/hr
Average speed for round trip = (2 × Speed1 × Speed2) / (Speed1 + Speed2)
= (2 × 24 × 40) / (24 + 40)
= (1920) / 64
= 30 km/hr