Question

p, q and r together can complete a work in 40 days. P and q together can complete the same work in 90 days. Then r alone can complete the same work in how many days?

Answer 1

p+q+r =40days 1days 1/40

p and q=1/90

r alone=1/40+1/90

then answer will come that is answer

mark me as brainlist