A car at $7 : 30 a m$ is moving at a constant speed of $4 k m m i n^{- 1}$ and an odometer reading recorded is $28568 k m$ . What would be the odometer reading at $9 : 15 a m$ ?

28673 k m

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28988 k m

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29255 k m

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28568 k m

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Solution

The correct option is B $28988 k m$
At $7 : 30 a m$ , the odometer reading of the car $= 28568 k m$
Speed of the car $= 4 k m m i n^{- 1}$
Total time interval between $7 : 30 a m$ to $9 : 15 a m = 1 h o u r, 45 m i n u t e s$
$= (60 + 45) m i n u t e s = 105 m i n u t e s$
Required distance $=$ speed of the car $\times$ time interval
$= 4 \times 105 k m = 420 k m$
Hence the odometer reading at $9 : 15 a m$
$= 28568 + 420 = 28988 k m$ .

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A car at 7:30 am is moving at a constant speed of 4 km min−1 and an odometer reading recorded is 28568 km. What would be the odometer reading at 9:15 am?

A car at $7 : 30 a m$ is moving at a constant speed of $4 k m m i n^{- 1}$ and an odometer reading recorded is $28568 k m$ . What would be the odometer reading at $9 : 15 a m$ ?