GIVEN: P and Q together can finish the work in 18.75 days Q and R together can finish that work in 50/3 days All the three persons together can finish that work in 75/7 days CONCEPT: Time and Work FORMULA USED: Time taken by A and B together to finish the work:
1
[
1
A
+
1
B
]
CALCULATION: Let time taken by P, Q and R alone to do the work = ‘p’, ‘q’ and ‘r’ respectively. Now,