R, S and T can finish a work in 20, 15 and 10 days, respecti

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R, S and T can finish a work in 20, 15 and 10 days, respectively. R works on all days and S and T work on alternate days with T starting the work on the first day. In how many days is the work finished?

[SSC CGL 24 July 2023 Shift 4 With Answers]

A

52/7

B

61/7

C

57/8

D

50/7

EXPLANATION

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