60% of the length of a pole is painted r...

`60%` of the length of a pole is painted red, `40%` of the rest is painted green and `50%` of the balance is painted blue. The remaining unpainted length of the pole is 30 cm. The length of the pole is-

`2cdot5` m

`3cdot2` m

`4cdot8` m

`5cdot6` m

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