# Time - practice problems - page 2 of 144

Time (latin tempus) is one of the fundamental physical quantities of SI. The base unit is 1 second. One second is defined as 9,192,631,770 transition oscillations in the Cs-133 atom (the atomic clock ticking). Time cannot be defined using other physical quantities - it is an essential - fundamental quantity. Derived units are minute, hour, day, week, year. For example, 1 minute is defined as 60 seconds. One hour is 3600 seconds. One day is 24 hours. Fractional seconds are 1 ms (millisecond), 1 μs (microsecond), and 1 ns (nanosecond). Frequency is the inverse of the duration of a phenomenon that repeats itself.#### Number of problems found: 2878

- A cake 2

Karen sliced a cake into 10 slices. She ate 2/10 of it and after some time she ate another 4/10 of it. How much of the cake did Karen eat? - Summer vacation

Rekha spent 3/8 of her summer vacation in Delhi, 1/16 in Mumbai, and ¼ in Chennai. What fraction of her summer vacation did he spend in all? - NYC block

Bijan wants to go running during his family's vacation to New York City. To do so, he will run a neighborhood block 20 times. Bijan runs a total of 8 miles. The block has a length of 3/20 miles. Use the formula for the perimeter of the neighborhood block - Richard

Richard is conducting an experiment. Every time he flips a fair two-sided coin, he also rolls a six-sided die. What is the probability that the coin will land on tails and the die will land on an even number?

- Bertha

Bertha went on a walk 5 times this week. Each time, she went 11/5 miles. How far did Bertha walk? - Rhombus 36

Rhombus ABCD with side 8 cm long has diagonal BD 11.3 cm long. Find angle DAB. - Monthly expenses

John's monthly expenses are analyzed as follows: 1/8 for stationery, 1/3 for fuel, 1/6 for parking, and the rest for food. His total expenses are 4500. Calculate the rand value of the food expenses. - Electronics price loss

Archie buys a TV set for 15000. After some time, he plans to sell it again and reduce the price by 800. What is the percent of loss? - Human population

The populations of two cities after t years can be modeled by -150t+50,000 and 50t+75,000. What is the difference in the populations of the towns when t=4?

- The midday

The midday temperature in Pensacola Beach was 84°F. For the next five hours, it changed to –2°F per hour. The expression 84 − |−2 ⋅ 5| represents the current temperature. What is the current temperature in degrees Fahrenheit? - A population

A population of fish starts at 8,000 and decreases by 6% per year. Use an exponential function to find the population of fish in 10 years. - Robotics team

The 4 robotics team members held a car wash to raise money. To attract customers, each person held a sign by the road for an equal portion of the car wash, which lasted 3 hours in all. How long did each person hold the sign? - A car 9

A car travels at 34 km/hr. How far does it take to travel in 2 hours? - Kelly earning with overtime

Kelly earns $12 an hour. She works 40 hours a week with time and a half for overtime. Kelly worked 46 hours. How much did she earn?

- The restaurant

The restaurant is 3/8 miles from the office. She makes the walk in 7 1/2 minutes. At the same rate, how long will it take her to walk the two miles from her home to her office? - Horseback riding

The total cost to go horseback riding is x dollars per hour plus a $2 fee for renting a helmet. Which expressions represent the cost, in dollars, for 4 people to go horseback riding for 3 hours each? Select all that apply. Responses: A = 4(3x+2) B = 3(4x+ - Drain and inlet

The reservoir is filled with inflow in 12 hours. It will drain through the drain in 9 hours. Can the tank overflow if we leave the inlet and outlet open at the same time? - An electrician 6

An electrician can wire 4 1/2 rooms in 3 hours. How long does it take him to wire each room? - Veronica

Veronica walks dogs in her neighborhood for extra money during the summer. For each dog walk, she earns $5.25. On Monday, she completed 3 walks, and on Tuesday, she completed 2 walks. She estimates that to save up for a new purse that costs $86, she must

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