Question

A square road 1 km each side exists around a building. I drive a car at 60 kmph on first 2 sides and 30 kmph on the 3rd side. At what speed should I drive on 4th side so that my average speed is 60 kmph while completing drive on the square road ? The answer is neither 90 kmph nor 120 kmph.

Answer 1

Here's your solution buddy