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If a body covers first half of its journ...

If a body covers first half of its journey with uniform speed `v_(1)` and the second half of the journey with uniform speed `v_(2)`. Then the average speed during whole journey.

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MODERN PUBLICATION-MOTION-EXAMPLE
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  12. A train covers half of its journey with a speed of 30 metre per second...

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  13. A train travels at a speed of 60 km/h for 0.52 h, at 30 km/h for the n...

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  14. A man walks at 1m/s for 60 minutes he takes rest for 20 minutes and th...

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