Time - 9th grade (14y) - math problems

Number of problems found: 527

  • Troops
    The route is long 147 km and the first-day first regiment went at an average speed of 12 km/h and journey back 21 km/h. The second day went second regiment the same route at an average speed of 22 km/h there and back. Which regiment will take route longer
  • Pediatrician
    Pediatrician this month of 20 working days takes 8 days holidays. What is the probability that on Monday it will be at work?
  • Work
    The first paver paves pavement for 27 hours. Second for 27 hours. Started the first paver and after 4 hours, join the second. How long will they finish the pavement?
  • Beer
    After three 10° beers consumed in a short time, there is 5.6 g of alcohol in 6 kg adult human blood. How much is it per mille?
  • Ravens
    The tale of the Seven Ravens were seven brothers, each of whom was born exactly 2.5 years after the previous one. When the eldest of the brothers was 2-times older than the youngest, mother all curse. How old was seven ravens brothers when their mother cu
  • Trains for people
    It is said that the train is synonymous to delay. Calculate the average speed of travel by train long 85 km, with regular train leave at 7:00 and arrive at 8:18, but train is late and has departure at 8:10 and arrive at 9:27.
  • Work
    Workers works 5 days a week and has 28 days of vacation a year. Calculate how many days is out of work and express it as a percentage. Consider that a year has 52 weeks.
  • Motion
    From two different locations distant 232 km started against car and bus. The car started at 5:20 with average speed 64 km/h. Bus started at 7:30 with average speed 80 km/h. When they meet? How many kilometers went the bus?
  • Motion
    Cyclist started at 9:00 from point S to point T. After 10 minutes, I followed him at the same speed as the second cyclist. Walker, which went from T to S, started at 9:35. After 71 minutes, he met the first cyclist, and after the next 8 minutes, the secon
  • Movement
    From the crossing of two perpendicular roads started two cyclists (each at the different road). One runs at average speed 28 km/h, the second at average speed 24 km/h. Determine the distance between them after 45 minutes cycling.
  • Gimli Glider
    Aircraft Boeing 767 lose both engines at 42000 feet. The plane captain maintain optimum gliding conditions. Every minute, lose 1910 feet and maintain constant speed 211 knots. Calculate how long it takes to plane from engine failure to hit the ground. Cal
  • Free fall
    Lloyd fall from height 7 m. Calculate the speed he hit the ground when falling with acceleration g = 9.81 m/s2
  • Subway
    Subway train went between two stations that gradually accelerated for 26 seconds and reached a speed of 72 km/h. At this rate, went 56 seconds. Then 16 seconds slowed to a stop. What was the distance between the stations?
  • Server
    Calculate how many average minutes a year is a webserver is unavailable, the availability is 99.99%.
  • Salary
    Calculate the equivalent annual salary to an hourly wage of $ 19. Assume a 42-hour workweek.
  • Pool
    If water flows into the pool by two inlets, fill the whole for 19 hours. The first inlet filled pool 5 hour longer than the second. How long pool take to fill with two inlets separately?
  • Daily average
    Calculate the average temperature during the day, when 15 hours were 20 °C and 9 hours was 13 °C.
  • Wind drift
    The plane flies at 900 km/h, passing distance 1800 kilometers with the wind and once again against the wind for 4 h 1 min. What is the wind speed?
  • The cyclist
    The cyclist went from village to town. The first half of the journey went at 20 km/h. The second half of the journey, which mostly fell, went at 39 km/h. All journey took 88 minutes. Calculate the distance from the village to the town.
  • Chords
    How many 4-tones chords (chord = at the same time sounding different tones) is possible to play within 7 tones?

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