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Amita, Suneha and Raghav start preparing...

Amita, Suneha and Raghav start preparing cardsfor all the persons of an old age home. In order to complete one card, they take 10, 16 and 20 minutes respectively. If all of them started together, after what time will they start preparing a new card together?

A

40 minutes

B

50 minutes

C

60 minutes

D

80 minutes

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