Time - math problems

Number of problems found: 1106

  • Annual growth
    exp_growth2 The population has grown from 25,000 to 33,600 in 10 years. Calculate what was the average annual population growth in%?
  • Biking
    cyclist Dhea is biking for 20 mins every day before going to school. She looked at her watch and she already achieved 10 hours of biking. How many days in total did she achieve?
  • Granddaughter
    calendar In 2014, the sum of the ages of Meghan's aunt, her daughter and her granddaughter was equal to 100 years. In what year was the granddaughter born, if we know that the age of each can be expressed as the power of two?
  • Weighted harmonic average
    workers Ten workers will do some work in 2 minutes, five workers in 10 minutes and three workers in 6 minutes. How many minutes per average worker per worker?
  • Clock mathematics
    clocks If it is now 7:38 pm, what time will it be in 30,033,996,480 minutes from now?
  • Quarter of an hour
    clocks2 If the clock showed a quarter of an hour more, it would be 10 minutes to 10 hours. How many hours do they show?
  • An airplane
    aircraft-02 An airplane flies 1440 km in 2 1/4 hours. What is its average speed in km per hour?
  • RC time constant
    capacitor You introduced 1 Coulomb worth of electrons into the inner volume of a dielectric material with ϵr=6. Thirty minutes later, you found that only 36.79% of the electrons were in the internal volume. Determine the conductivity σ of the dielectric material.
  • 14 years
    family Kája is 14 years old. Mom 44. How many years will mom be 4 times older?
  • Volume per time
    inlet How long does fill take for a pump with a volume flow of 200 l per minute fill a cube-shaped tank up to 75% of its height if the length of the cube edge is 4 m?
  • Aman
    clocks2 Aman, Anna and Tina are participating in the school race. Anna completes a lap in 120 minutes, Aman completes a lap in 240 minutes and Tina completes a lap in 60 minutes. If they all started at the same time, then after how long will they meet again?
  • Susan
    penize Susan bought an oven in a paylite installment plan of Php 2,070 per month for six months. The payment is automatically debited from her credit card. What is the net debit on her card after six months from the installment plan alone?
  • Illness
    pharmacy Peter is ill and must take medication three times a day for one tablet. For how many days is a pack of 30 tablets enough for him, when on the third day he takes one tablet only in the morning and evening?
  • Three
    bus27 Three buses follow the same circular route. The first driver is the slowest because he has many stops, and it takes him 90 minutes to cross the route. The second driver will pass the circuit in 1 hour. The third driver has the fewest stops, and the circui
  • Up and down motion
    ballistic We throw the body from a height h = 5 m above the Earth vertically upwards v0 = 10 m/s. How long before we have to let the second body fall freely from the same height to hit the Earth at the same time?
  • Borrowing bicycle
    cukriky Jakub lent a bicycle to friends who wanted to ride it. For a three-hour bike ride, Jakub received 2 chocolates. Yup. If you wanted a bike for 2 hours, you had to give Jakub 12 candies. Peter gave Jakub 1 chocolate and 3 candies. How long can Peter ride Ja
  • The temperature 9
    teplomer The temperature at 9 AM is 2 degrees. The temperature rises 3 more degrees by noon. Which expression describes the temperature at noon? Calculate the new temperature value.
  • Two xeroxes
    xerox The performances of the two copiers are in the ratio 3: 4. A machine with higher power will make 7,200 copies in one hour. How many copies will both machines make together in 5 hours?
  • This year
    calendar This year 2020 is a leap year. How many leap years there had been be since 1904?
  • Six painters
    painter Six painters paint an area of 120 m2 in 4 hours. How long does it take for 12 painters to paint 480 m2 with the same performance?

Do you have an interesting mathematical word problem that you can't solve? Submit a math problem, and we can try to solve it.



We will send a solution to your e-mail address. Solved examples are also published here. Please enter the e-mail correctly and check whether you don't have a full mailbox.

Please do not submit problems from current active competitions such as Mathematical Olympiad, correspondence seminars etc...



Do you want to convert time units like minutes to seconds?