Ravika alone can complete 3/5 of a work = 105 days ⇒ Ravika alone can complete the whole work = 105 × 5/3 = 175 days ⇒ Mallika can complete 1/3 of work = 50 days ⇒ Mallika can complete the whole work = 50 × 3 = 150 days ⇒ Together they can complete the whole work = (d1 × d2)/ (d1 + d2) ⇒ Together they can complete the whole work = 175 × 150/325 days ⇒ Together they can complete 26/35 of the work =
175×150
325
×
26
35
= 60 days ∴ Together they can complete 26/35 of the work in 60 days.