) Pedro can paint a fence 50% faster than Juan and 20% faster than Pilar, and together they can paint a given fence in 4 hours. How long will it take Pedro to paint the same fence if he had to work alone?

To get to work, Santa jogs 3 km to the train and then rides the remaining 5 km. If the train goes 40 km per hour faster than Santa's constant rate of jogging and the entire trip takes 30 minutes, how fast does Santa jog?

When Josh and Sean were each 5 years old, Josh was 1.5 inches taller than Sean. Josh grew at an average rate of 2.75 inches per year from the time that he was 5 years old until the time he was 13 years old. Josh was 63 inches tall when he was 13 years old. How tall was Sean when he was 5 years old

Alex can pour a concrete walkway in x hours alone while Andy can pour the same walkway in two more hours than Alex a. How fast can they pour the walkway if they work together?  b. If Emman can pour the same walkway in one more hours than Alex, and Roger can pour the same walkway in one hour less than Andy, who must work together to finish the job with the least time.

Two classmates have decided to read all the volumes in a popular series of books. Mia has already read 12 volumes and will continue to read new ones at a rate of 1 volume per week. Beth, who hasn't started reading the series yet, will read 4 volumes per week. At some point, Beth will catch up with Mia and they will be reading the same book. How long will that take? How many volumes will each girl have read by then? In ? weeks, the girls will each have read ? volumes in the series.

Two persons are to run a race, but one can run 9 meters per second, whereas the other can run 5 meters per second. If the slower runner has a 50-meter head start, how long will it before the faster runner catches the slower runner, if they begin at the same time?

Usually, Dolores has to stock the shelves by herself and it takes her 7.2 hours. Today Camille helped Dolores and they were able to finish the task in 2.8 hours. How long would it have taken Camille if she were working alone?

Sam and Cat both drive cars starting from the same point. Sam drives north, and travels 50  miles in 60 minutes, and Cat drives south, traveling 18 miles in 20 minutes. If they each continue at the same rate, how many miles apart will they be after 2 hours?