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A particle moving in straight line cover...

A particle moving in straight line cover half the distance with speed `3 ms^-1`. The other half is covered in two equal time intervals with speed `4.5 ms^-1 and 7.5 ms^-1` respectively. The average speed of the particle during motion is

A

`4 ms^-1`

B

`5 ms^-1`

C

`5.5 ms^-1`

D

`4.8 ms^-1`

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