With a uniform speed a car cover a certain distance in 8 hours. Had the speed been increased by 4 km/hr, the same distance could have been covered in 7 1/2 hours. What is the distance covered?
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It's 30 km.
And when it hadn't increased its speed by 4km/hr, it has traveled a distance of 30 km in 8 hours with a speed of 3.75.
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