Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in 2 hours, how many minutes will it take both pipes to fill of the tank?

Keep Cool Air-Conditioning charges $ 60 for the first 30 minutes of every house call and $ 15 for each additional quarter hour. In addition, the customer has to pay for any required parts needed for repairs. If Mrs. Lewis’s bill was $ 225, which included $ 90 for parts, how long did the air-conditioning repair technician work?

A watch gains 7 minutes & 6 seconds every 6 days. If the rate of gain is constant, how much does the watch gain in one day?

Charles is able to husk 216 ears of corn in hours. What was his rate per minute?

Working at the same constant rate, 4 machines, working together, take 8 days to make a total of 16 birdhouses.

How many such machines are required to make 64 birdhouses in 16 days?

Jack and Mack start simultaneously towards each other from two places which are 1260 km apart. They travel with respective speeds of 130 kmph and 122 kmph. What is the total distance they covered in the last minute before they cross each other?

Working alone, pump A can empty a pool in 3 hours. Working alone, pump B can empty the same pool in 2 hours. Working together, how many minutes will it take pump A and pump B to empty the pool?

Ted can finish a job in 3 hours and Ann can finish the same job in 4 hours. If Ted works alone for 1 hour, and then Ann and Ted work together to finish the job, for how many more hours do they have to work together?

One tap, working alone at its maximum constant rate, can fill a certain sink in 287 seconds. A second tap, working alone at its maximum constant rate, can fill the same sink in 283 seconds. If both taps work together at their respective maximum constant rates, the time it will take to fill the sink is closest to

Three hoses work to fill a tub at at different rate. Hose A and B, working together, can fill the tub in 6/5 of an hour. Hoses A and C can fill it in 3/2 an hour. Houses B and C can fill it in 2 hours. How long does it take all 3 hoses, working together, to fill the tub?