Time and Work Questions

A can finish a task in $20$ days and B can finish the same task in half the time taken by A. Working together, what part of the task can they finish in a day?

In a typing shop, Lalit can complete typing of a book in 9 days, while Amit can finish the same work in 8 days. How many days will they take together to complete the work?

Suppose every three adults consume 2 litres of milk and 0.5 kg sugar every day, and the daily consumption of every five children is double the milk and half of the sugar than what the three adults consume. A family has 5 adults and 8 children. Their expenditure on milk and sugar for a month of 30 days, if a half-litre milk packet costs Rs. 25 and a one kg sugar packet costs Rs. 80, is:

Rahul can complete a work in 12 days and Ayush in 15 days. If they work together for 3 days, then the fraction of work that will be left is:

A and B can do a work in 15 days and 30 days, respectively. They start working together, but A leaves after 3 days. How much time will B take to complete the remaining work?

Eight labourers working 10 hours a day completed a work in 18 days. If only 5 labourers are working, then in how many hours a day should they work to finish the work in 24 days?