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Time & Distance

A car travels...

Question

A car travels 8 km in the first quarter of an hour, 6 km in the second quarter and 16 km in the third quarter. The average speed of the car in km per hour over the entire journey is

A

30

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B

36

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C

40

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D

24

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Solution

The correct option is C
40
$A v e r a g e S p e e d = \frac{T o t a l d i s t a n c e}{T o t a l t i m e}$

$\frac{T o t a l d i s t a n c e}{T o t a l t i m e s} = \frac{(8 + 6 + 16) k m}{(\frac{1}{4} + \frac{1}{4} + \frac{1}{4}) h r}$

$= \frac{30 k m}{\frac{3}{4} h r} = 40 k m / h r$

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