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The reading on the odometer of a car at $8.40 a . m$ . is $55, 891 km$ . After travelling a certain distance, the odometer shows $55, 912 km$ at $8.50 a . m$ . Calculate the average speed of the car in $km / h .$

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132 km / h

214 km / h

126 km / h

200 km / h

answer is C.

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Detailed Solution

The average speed of the car in

126 km / h

.
Given that, reading on the odometer of a car at

8 : 40 a . m . = 55, 891 km

,
And reading on the odometer of a car at

8 : 50 a . m . = 55, 912 km

So, the distance covered by the car is

55912 - 5589 = 21 km

It means the car covers

21 km

10 \min

because time interval

t = 8 : 50 - 8 : 40 = 10 \min

We know that

speed = \frac{distance covered}{time interval}

Speed = \frac{21 km}{10 \min}

And average speed in

km / h

is ;

= \frac{21 km}{\frac{1}{6} h}

= 21 \times 6 km / h

= 126 km / h

(since

1 \min = 1 / 60 h

)

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