An aeroplane travels 2500 Km, 1200 Km and 500 Km at 500 Km/h, 400 Km, and 250 Km/h, respectively.
The average speed is:

420 Km/h

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410 Km/h

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405 Km/h

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575 Km/h

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None of these

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Solution

The correct option is A 420 Km/h
The average speed can be calculated as shown below:
$\begin{matrix} D i s t a n c e & S p e e d & T i m e 2500 K m & 500 K m / h & 5 h r s 1200 K m & 400 K m / h & 3 h r s 500 K m & 250 K m / h & 2 h r s T o t a l 4200 K m & 10 h r s \end{matrix}$
Average speed $= \frac{4200}{10} = 420 K m / h$

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