Question

Ram can do a work in 12days rahim in 20 days and robert in 15 days how long will they take to do the work it they work together?

Answer 1

Dear friend,

Time taken by Ram = 1/12 days
Time taken by Rahim = 1/20 days
Time taken by Robert = 1/15 days

Time taken of all three to do the work,

$\frac{1}{12} + \frac{1}{20} + \frac{1}{15}$

$\frac{5 + 3 + 4}{60}$

$\frac{12}{60} = \frac{1}{5}$

Time taken by all of them = 1 ÷ (1/5)
= 5 days

Answer. Three of them together will take 5 days to complete the work.

Hope it helps !!!