Question

please solve it soon​

Answer 1

Answer:

24 minutes

Let C complete work in x days .Work efficiency for each

$\frac{1}{30} \: \: \frac{1}{40} \: \: and \: \: \frac{1}{x}$

Sum of these will be 1/10

$\frac{1}{30} + \frac{1}{40} + \frac{1}{x} = \frac{1}{10} \\ \\ 40x + 30x + 1200 = 120x \\ 50x = 1200 \\ x = 24$