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John and David can do a piece of work separately in 30 and 20 hour respectively. in how many hours will they finish it work togeth

By Serenity

John and David can do a piece of work separately in 30 and 20 hour respectively. in how many hours will they finish it work together​

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Serenity

One bag contains 6 black, 2 brown, 4 green and 3 white balls. If picked up 5 balls at random. So what is the probability that at

“She is calling me.” Passive voice of this is
A) I am calling her.
B) I am being called by she.
C) I am being calle

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