Time and Work Questions

Vikram and Vivek can finish a work in 50 days. They worked together for 20 days and then left. How much work has been done by them?

G is twice as fast as S in doing work. If G can do a work in 30 days less than S, how many days will they take to complete the work together?

R is 80% more efficient than S. If S alone can make a book in 90 days, then R alone can make the book in how many days?

B would have taken 10 hours more than what A would have taken to complete a task if each of them worked alone. Working together they can complete the task in 12 hours. How many hours would B take to do 50% of the task?

A does 75% of a work in 25 days. He then calls in B and they together finish the remaining work in 5 days. How long B alone would take to do the whole work?

A is 50% more efficient than B. They together start the work and 7/12th of work is left after 8 days. Find in what time B alone will complete the whole work.

P can do (1/4)th of work in 10 days, Q can do 40% of work in 40 days and R can do (1/3)rd of work in 13 days. Who will complete the work first?

Karteek is twice as good a foreman as Raju and together they finish a piece of work in 20 days. In how many days will Raju alone finish the work?