Time - practice problems
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: 3262
- Simple interest pa
If a sum of money at a rate of simple interest, doubles in 8 years, then it will become 3 times in how many years? - Two sons and man
A man's age is three times the sum of the ages of his two sons. After five years, his age will be twice the sum of the ages of his two sons. Find the age of the man. - Motorboat : current
The ratio of speeds of a motorboat to that of the current of water is 36:5. The motorboat goes along with the current in 5h 10min. Find the time to come back of the motorboat. - Father and son
Age of father is 5 times the age of his son. After 10 years, age of father will be 3 times the age of son. Find the present age of both of them . - Walking speeding
Susan walks from her home to office at 16 km/h, she is late by 5 min. If she walks by 20 km/h, she reaches 10 min before the office time. Find the distance of her office from her house. - Common work 2
Person A works twice as fast as person B. If both of them can together finish a piece of work in 12 days then person B alone can do it in how many days? - Three legs journey
A train runs for 3 h at the speed of 40 km/h and then for 4.5 h at the speed of 60 km/h.Thus it covers 3/5th part of the whole distance. It wants to cover the remaining distance in 4 h, find the average speed of the train for remaining distance. - A river
A river is flowing at a speed of 5 km/h. A man can swim 20 km/h in still water. The man starts swimming from A to B, distance 30 km. After reaching B the man turn back and stop swimming after reaching point A . Find the total time. - Below zero
The temperature on Saturday was 14.5 degrees below zero. The temperature then decreased by 2 degrees. What would the temperature be after it decreased? - Circular track 3
Henry and Margo both began traveling around a circular track. Henry is riding his bike, and Margo is walking. It takes Henry 7 minutes to make it all the way around, and Margo takes 12 minutes. How many minutes will pass until they meet at the starting li - Velocity ratio 2
The ratio between the rates of walking of A and B is 2:3. If the time taken by B to cover the certain distance is 36 min, then, find the time taken by A - Negative degrees Celsius From 1:00 a.m. to 10:00 a.m., the temperature dropped 7°C. From 10:00 a.m. until 4:00 p.m., the temperature then rose 15°C. From 4:00 p.m. to 10:00 p.m., the temperature then dropped 4°C. At 10:00 p.m., the temperature was −14°C. What was the temperature
- Three athletes Three athletes are training for a marathon. Sebastian runs 8.325 miles. Jordan runs 3.1 times the distance Sebastian runs. Rocky runs 6.77 miles less than Jordan. How many total miles did the athletes run?
- Daughter and Mom A mother is seven times as old as her daughter. In 7 years time she will be five times as old as her daughter. How old is each of them?
- Temperature in Portland On Sunday afternoon the temperature in Portland was 2°C. By midnight the temperature had dropped by 8°C. What was the temperature at midnight?
- Mother and daughter 6 A mother is six time as old as her daughter. In 6 years time she will be four times as old as her daughter . How old is each of them?
- A road 2
A road crew must repave a road that is 4/5 miles long. They can repave 1/20 miles each hour. How long will it take the crew to repave the road? Write your answer in simplest form. - A train 7
A train overtakes two persons. They are walking in the same direction as the train at the rate of 2 km/hr and 4 km/hr. The train passes them completely in 9 and 10 seconds respectively. Find the length of the train. - A train 6
A train covers a distance 10km, 20km, and 30km in 50 kmph, 60 kmph and 90 kmph respectively. Find the average speed of the train (in km/h). - Goods train A goods train runs at the speed of 72 kmph and crosses a 250 m long platform in 26 seconds. What is the length of the goods train?
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