If Johnny can mow the lawn in 30 minutes and with the help of his brother, Bobby, they can mow the lawn 20 minutes, how long would it take Bobby working along to mow the lawn?

Tarik can complete a job in 12 minutes. If Andy helps Tarik, they can complete the job in 4 minutes. How long would it take for Andy to complete the job on his own?

A and B working together can mow a field in 56 days and with the help of C , they could have mowed it in 42 days. How long would C take to mow the field by himself ?

Using a riding lawnmower, Je can cut his lawn in 45 minutes. Using a push power, Joe's son can cut the lawn in 3 hours. If they work together, how long will it take them to cut the lawn?

If a man cuts the grass of a lawn in T minutes ,what part of the lawn can be he cut in 30 minutes ?

The Bubna dam has four inlets. Through the first three inlets, the dam can be filled in 12 minutes, through the second, the third and the fourth inlet, it can be filled in 15 minutes, and through the first and the fourth inlet, in 20 minutes. How much time will it take all the four inlets to fill up the dam?

A pipe can fill a tank in 12 minutes. Another pipe can empty a tank in 20 minutes. They are opened in alternate minutes, How long will it take to fill the tank?

A water tank is 2/5 th full. Pipe A can fill the tank in 10 minutes and pipe 8 can empty it in 6 minutes . If both the pipe are opened , how long will it take to empty or fill the tank completely ?

A water tank is 2/5 th full. Inlet A can fill the tank in 12 minutes while an outlet pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely?