in this question i was using the Formula W= #rt and it gave me a different answer what are the specific terms in the question that tell us weather to use number of workers or not
Let R be the rate of work of a pump. Let W be the work of filling the complete tank.
Rate of work = Work done / Time taken … (1)
Condition 1 → (Rp + Rr + Rt) = \frac{W}{5} … (2)
Condition 2 → (Rp + Rr) = \frac{W}{7} … (3)
Now since you know Rp + Rr substitute it in equation 2 to get Rt = \frac{W}{5} - \frac{W}{7} = \frac{2W}{35} … (4)
If T works alone, from 1, we know Rt = \frac{W}{Time taken}. Substitute Rt from equation 4 and simplify.
in condition two shouldn’t it be W / 7
Yea sorry. changed it! 