Time and Work T...

If 5 men or 9 women can do a piece of work in 19 days, how long will it take to complete the same work with 3 men and 6 women?

A tank can be emptied by three taps in 3 hours. The first tap alone can empty it in 6 hours and second tap alone can empty it in 9 hours. How many hours will the third tap alone take to empty the tank?

20 men could do a piece of work in 30 days working 4 hours a day, 30 men worked for 20 days for 3 hours a day. Then all were laid off, except one. How many more days would it take the last man to complete the remaining work, working 10 hours a day?

It was estimated that 20 men would complete a work in 50 days working for 5 hours a day. But after 15 days from the start of work, 10 men dropped out of work. How many hours per day did the remaining men have to work to complete the work on time?