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  4. A car travels a distance x km on a straight road in 3 hours and then returns immediately to the starting point in next four hours with uniform speed. Its average speed in first four hours (in km / h ) is

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Q. A car travels a distance $x km$ on a straight road in $3$ hours and then returns immediately to the starting point in next four hours with uniform speed. Its average speed in first four hours (in $km / h )$ is

Solution:

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$V_{avg} = \frac{x + \frac{x}{4}}{4} = \frac{5x}{16}$