With a uniform speed a car covers the distance in $8$ hours. Had the speed been increased by $4$ km/hr the same distance could have been covered in $7 \frac{1}{2}$ hours. What is the distance covered ?

420

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480

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640

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None of these

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Solution

The correct option is B $480$ km
Let the distance be $x$ Km. Then,
$\frac{x}{7 \frac{1}{2}} - \frac{x}{8} = 4$
$∴$ $\frac{2 x}{15} - \frac{x}{8} = 4$
$∴ x = 480 k m .$

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With a uniform speed a car covers the distance in 8 hours. Had the speed been increased by 4 km/hr the same distance could have been covered in 712 hours. What is the distance covered ?

The correct option is B 480 kmLet the distance be x Km. Then,x712−x8=4∴ 2x15−x8=4∴x=480km.

With a uniform speed a car covers the distance in $8$ hours. Had the speed been increased by $4$ km/hr the same distance could have been covered in $7 \frac{1}{2}$ hours. What is the distance covered ?

The correct option is B $480$ km
Let the distance be $x$ Km. Then,
$\frac{x}{7 \frac{1}{2}} - \frac{x}{8} = 4$
$∴$ $\frac{2 x}{15} - \frac{x}{8} = 4$
$∴ x = 480 k m .$