Mean + time - practice problems - page 8 of 10
Number of problems found: 191
- Work together
Michal and Dorota would do the work together in 2.25 hours. If Dorota had to do it herself, it would have taken her 6 hours longer than Michal. Determine when Dorota would do the work herself and that Michal would do it himself. - Moon
We see Moon in the perspective angle 28'. Moon's radius is 1740 km at the time of the full Moon. Calculate the mean distance of the Moon from the Earth. - Distance 4051
The distance from Nitra to Ostrava is 257 km. From both places, two cars drove towards each other at the same time. The car from Nitra drove 800m per hour slower than the car from Ostrava. What was the average speed of the cars if the cars met after 150 m - Continues 4034
Karel always follows the same route to school. If he continues at the store, the journey takes him exactly 10 minutes. If he stops at a store to buy a snack, his journey takes 5 minutes longer. In November 2015, his journey to school took an average of 13
- Independently 3874
Josef would do the work himself in 5 hours. Josef and Michal would do the work together in 3.5 hours. Determine how long it would take Michal to do the job independently. - Determine 3851
Michal would cut the fence himself in 12 hours. It would take Michal and Juraj 8 hours together. Determine how long it would take for Juraj to do the job. - Together 3781
Milos would do the work himself in 5 hours. How much would it take Dan to do the job together in two hours? - Cleaners
Milan would clean up the room for 2.5 hours, and Eric would take 10 hours. How long do they sweep the room together? - Daily temperature
The average daily temperature measurements for one week every day at the same hour was -2.8 °C. We measured all temperatures on different days are different. The highest daily maximum temperature was 2.4 °C, and the lowest was -6 °C. Determine the options
- Together 3491
One painter would paint the school in 15 days. Together with the second painter, they painted the school in 6 days. In how many days the second painter would have painted the school himself? - Working together
One painter painted the nursery in 10 days, the second in 8 days. How many days will the nursery be painted if they work together? - Timber log
The ship goes from point x to y. Downstream it takes 4 hours, and upstream 6 hours. How long does it take from a point x to y a log? - Remaining 3195
A cyclist covered a track of 40m in 5s. The first section of the 30m track was covered in 3s; the remaining section was covered in 2s. Specify: a) the average speed of the cyclist on the first section of the track b) the average speed of the cyclist on th - Fog
The car started in fog at a speed of 30 km/h. After a 12-minute drive, the fog dissipated, and the driver drove the next 12 minutes distance, 17 km. The driving conditions deteriorated during the last 17 km long, and the driver drove at 51 km/h. a) Calcul
- Two pumps
The first pump fills the tank in 24 hours second pump in another 40 hours. How long will it take to fill the tank if it operates both pumps simultaneously? - Elephants 2906
In 1979, 1.3 million elephants lived in Africa. By 1989, their number had dropped to 600,000. On average, how many elephants have died each year during this period? - Registers 2827
When eight cash registers are open in the grocery store, customers wait for an average of 12 minutes. What will be the waiting time if the other two cash registers open? - Forth and back
Car drive from point A to point B at a speed of 78 km/h and back at 82 km/h. If I went there and back at a speed of 81 km/h journey would take five minutes less. What is the distance between points A and B? - Distribution 2645
The worker operates 600 spindles on which the yarn is wound. The probability of tearing the yarn on each spindle at time t is 0.005. a) Determine the probability distribution of the number of torn spindles at time t and the mean and variance. b) What is t
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