P works 25% more efficiently than Q and Q works 50% more efficiently than R. To complete a certain project, P alone takes 50 days less than Q alone. If, in this project P alone works for 60 days and then Q alone works for 145 days, in how many days can R alone complete the remaining work?  Choose one.
A) 50 days
B) 110.6 days
C) 100 days
D) 150 days
E) 80 days

Rationale: p works 25 % more efficiently than q : something that takes q 5 days , takes p 4 days q works 50 % more efficiently than r : something that takes r 7.5 days , takes q 5 days p alone takes 50 days less than q : for every 4 days p works , q has to work an extra day . hence p alone can do it in 200 days and q alone in 250 days and hence r alone in 395 days p works for 60 days - - > 60 / 200 work done = > 30 % q works for 145 days - - > 145 / 250 work done = > 58 % 28 % work left . . . r alone will take 28 % * 395 = 110.6 days answer is ( b )
Answer: B