Question

47. A and B are two postmen. They can
together deliver 100 letters in 4hours. If A
alone can deliver 100 letters in 6 hours,
then B alone can deliver 100 letters in?
A. 8 hours
B. 10 hours
C. 12 hours
D. 14 hours​

Answer 1

Answer:

8 hours ok aa

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Answer 2

B takes 10 hours to deliver letter .It means option B is correct