A car can finish a certain journey in $10$ hours at the speed of $48$ km/hr. In order to cover the same distance in $8$ hours, the speed of the car must be increased by

6

km/hr

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7.5

km/hr

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12

km/hr

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15

km/hr

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Solution

The correct option is D $12$ km/hr
Distance of the entire journey $= (48 \times 10) k m$
$= 480 k m$
If the time taken $=$ 8 hours, then increased speed $= \frac{480}{8} k m / h r = 60 k m / h r$
$∴$ Increased in speed $= 60 k m / h r - 48 k m / h r = 12 k m / h r$

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A car can finish a certain journey in 10 hours at the speed of 48 km/hr. In order to cover the same distance in 8 hours, the speed of the car must be increased by

The correct option is D 12 km/hrDistance of the entire journey =(48×10)km =480kmIf the time taken = 8 hours, then increased speed =4808km/hr=60km/hr∴ Increased in speed =60km/hr−48km/hr=12km/hr

A car can finish a certain journey in $10$ hours at the speed of $48$ km/hr. In order to cover the same distance in $8$ hours, the speed of the car must be increased by

The correct option is D $12$ km/hr
Distance of the entire journey $= (48 \times 10) k m$
$= 480 k m$
If the time taken $=$ 8 hours, then increased speed $= \frac{480}{8} k m / h r = 60 k m / h r$
$∴$ Increased in speed $= 60 k m / h r - 48 k m / h r = 12 k m / h r$