Question 65

A, B and C can complete a piece of work in 4, 28 and 56 days respectively. Working together, they can complete the same work in how many days ?

Solution

Simple approach to find it-

$$\frac{1}{\frac{1}{4} +\frac{1}{28}+\frac{1}{56}}$$

=$$\frac{56}{17}$$ i.e B

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