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 .
The answer is 28.69.
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