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Time work and safety questions are very important for various moment and private examinations. If you are preparing for bank IBPS SBI PO clerk exam then you can expect at least 2 to 3 questions from this area. Also what time and speed questions are asked in state government job exam, SSC, private job written exams.
In this post we will illustrate some important work time questions with tips and tricks to solve these question fast.
Type 1. formula for Speed = Distance (in unit of length)/Time (in unit of time)
Illustration : The distance between two stations is 540 km. A train takes 3 hours to cover this distance. Calculate the speed of the train in km/hr and m/s.Sol: Speed = Distance/Time = 540/3×180 km/hr. To convert speed into m/s we need to multiply 180 by 5/18. So required speed = 180 × 5/18 = 50 m/s.
Type 2. Speed and distance formula: Average Speed = Total Distance Travelled/Total Time Taken
Illustration : A train covered first 120 km at a speed of 20 km an hour and then covered the remaining 180 km at a speed of 45 km an hour. Find its average speed.Sol: Total distance = 120 + 180 = 300 km. Time taken for the first 120 km = 120/20 → 6 hrs.
Time taken for the next 180 km = 180/45 → 4 hrs. Total time taken = 6 + 4 = 10 hrs.
Average Speed =Total Distance Travelled/Total Time Taken = 300/10 = 30 km/hr.
Type 3. Average Speed: When the time travelled is the same:The average speed of traveling at two different speeds for the same time span is just the simple average of these two speeds.
Illustration : A motorist travels one hour at an average speed of 45 kmph and the next hour at an average speed of 65 kmph. Then what is his average speed?Sol: (45 + 65) ÷ 2 = 55 kmph. The total distance traveled by the motorist in these two hours = 65 + 45 = 110 km and he has taken two hours. Therefore, his average speed = 55 kmph.
Question : A man goes from A to B at a speed of 20 kmph and comes back to A at a speed of 30 kmph. Find his average speed for the entire journey?A. 20 kmphB. 24 kmphC. 28 kmphD. 32 kmph
Answer: B. 24 kmph
Explanation: Distance from A and B be ‘d’
Average Speed = total distance / total time
Average Speed = (2d) / [(d/20) + (d/30)]
= (2d) / [5d/60) => 24 kmph
Questions : Convert the 13/36 m/s into kilometers per hour?A. 1.2 kmphB. 1.3 kmphC. 1.4 kmphD. 1.5 kmph
Answer: B. 1.3
Explanation: 13/36 m/s = 13/36 * 18/5
= 13/10 = 1.3 kmph
By travelling at 40 kmph, a person reaches his destination on time. He covered two-third the total distance in one-third of the total time. What speed should he maintain for the remaining distance to reach his destination on time?
A. 15 kmph
B. 20 kmph
C. 25 kmph
D. 30 kmph
Answer: B. 20 kmph
Explanation: Let the time taken to reach the destination be 3x hours. Total distance = 40 * 3x = 120x km
He covered 2/3 * 120x = 80x km in 1/3 * 3x = x hours
So, the remaining 40x km, he has to cover in 2x hours would be required speed = 40x / 2x = 20 kmph
What distance will be covered by a bus moving at 72 kmph in 30 seconds?
A. 450 m
B. 500 m
C. 600 m
D. 750 m
Answer: C. 600 m
Explanation: 72 kmph = 72 * 5/18 = 20 mps
D = Speed * time = 20 * 30 = 600 m
Walking with 4/5 of my usual speed, I miss the bus by 5 minutes. What is my usual time?
A. 15 mins
B. 20 mins
C. 25 mins
D. 30 mins
Answer: B. 20 mins
Explanation: Speed Ratio = 1:4 / 5 = 5:4
Time Ratio = 4:51 ——– 5 4 ——— ? => 20
|11. A man travelled a distance of 6161 km in 99 hours. He travelled partly on foot at 44 km/hr and partly on bicycle at 99 km/hr. What is the distance travelled on foot?|
|A. 1414 km||B. 1616 km|
|C. 1818 km||D. 1212 km|
|. An aeroplane covers a certain distance at a speed of 240240 kmph in 55 hours. To cover the same distance in 123123 hours, it must travel at a speed of:|
|A. 660660 km/hr||B. 680680 km/hr|
|C. 700700 km/hr||D. 720720 km/hr|