A person travels from Kolkata to Ahmedabad at a speed of 9km/hr and returns back to Kolkata by the same route at a speed of 18 km/hr. Find his average speed (in km/hr) during the entire journey.
A person travels from Kolkata to Ahmedabad at a speed of 9km/hr and returns back to Kolkata by the same route at a speed of 18 km/hr. Find his average speed (in km/hr) during the entire journey. एक व्यक्ति 9km/hr की चाल से कोलकाता से अहमदाबाद जाता है तथा उसी मार्ग से 18 km/hr की […]