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Standard VII

Physics

Average Speed

An odometer r...

Question

An odometer read $250 k m$ when Mahesh started his car journey from his house to his office. After he reached there in an hour, it was showing $271 k m.$ Find the average speed of his car.

271 k m / h

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250 k m / h

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11 k m / h

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21 k m / h

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Solution

The correct option is D $21 k m / h$
Initially odometer read $250 k m$ which meant that before starting the car journey, the car had travelled a total distance of $250 k m$ .

Now as he ended his journey from his home to his office, he covered a distance of
= ( $271 - 250) k m = 21 km$

Time taken = $1 h r$
$W e k n o w, average s p e e d = \frac{T o t a l d i s tan c e c o v e r e d}{T o t a l t i m e t a k e n} = \frac{21}{1} = 21 k m / h$

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An odometer read 250 km when Mahesh started his car journey from his house to his office. After he reached there in an hour, it was showing 271 km. Find the average speed of his car.

An odometer read $250 k m$ when Mahesh started his car journey from his house to his office. After he reached there in an hour, it was showing $271 k m.$ Find the average speed of his car.