A classical mechanics problem by Sharad Roy

A car moves from Village A to Village B with a speed of 30 kmph. After it reaches village B, it takes a U-turn and starts heading to village A. It travels half of its time with a speed of 25 kmph and other half with a speed of 20 kmph. Find the average speed of the car during the whole journey?

Note: Speed of car is uniform when it travels from village A to B, while when it is heading back to Village A from B its speed's are different i.e. 20 kmph and 25 kmph. You need to find average speed of car during the whole journey.

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