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:(in $km/h$)

  • A

    $420$

  • B

    $410$

  • C

    $405$

  • D

    $575$

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