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39
M: +1.00/-0.25

A, B and C can do a work on their own in 5, 10 and 15 days respectively. Calculate the time required by B and C to do it together.

 

[IB ACIO Grade II Previous Paper 5 (Held on: 18 Feb 2021 Shift 2)]
A
B
C
D

EXPLANATION

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