General Q&A for Class 12 · Page 174
5,215 free answers in General for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- GeneralClass 12All
What is the average speed for 1000 miles in 24 hours?
Average Speed = 1000 miles ÷ 24 hours = 41.67 mph (approximately 41.7 mph)
- GeneralClass 12All
How a train travels 60 km in 1.5 hours?
The average speed would be 60 km ÷ 1.5 hours = 40 km/h
- GeneralClass 12All
How a car travels 165 km in 3 hours?
The average speed would be 165 km ÷ 3 hours = 55 km/h
- GeneralClass 12All
: What is the speed of 10 km in 30 minutes?
First convert 30 minutes to 0.5 hours. Speed = 10 km ÷ 0.5 hours = 20 km/h
- GeneralClass 12All
What is 100 km in 2 hours?
Speed = 100 km ÷ 2 hours = 50 km/h
- GeneralClass 12All
What is 200 km at 40 km/h?
This question asks for time, not speed. Time = 200 km ÷ 40 km/h = 5 hours
- GeneralClass 12All
What is the speed of 300 km in 5 hours?
Speed = 300 km ÷ 5 hours = 60 km/h
- GeneralClass 12All
What is the average speed of a car that travels 150 km in 3 hours?
Average Speed = 150 km ÷ 3 hours = 50 km/h
- GeneralClass 12All
What is 150 km in 2 hours?
Speed = 150 km ÷ 2 hours = 75 km/h
- GeneralClass 12All
How to calculate average speed with only distance?
You cannot calculate average speed with distance alone you must also know the time taken. Average speed requires both distance and time. If you only have distance, you need additional information such as time, or speeds and their durations, to determine average speed.
- GeneralClass 12All
Can you measure the average speed and average velocity?
Yes, both can be measured. Average speed requires measuring the total path distance and time. Average velocity requires measuring the straight-line displacement from starting to ending position and time. For motion in one direction, they may be equal; for circular or back-and-forth motion, they differ.
- GeneralClass 12All
What is the average speed of 120 km in 3 hours?
Average Speed = 120 km ÷ 3 hours = 40 km/h
- GeneralClass 12All
What is the average speed of 180 km in 3 hours?
Average Speed = 180 km ÷ 3 hours = 60 km/h This means if you traveled a total distance of 180 kilometers over 3 hours, your average speed was 60 kilometers per hou
- GeneralClass 12All
Is velocity an average speed?
Not exactly. Velocity includes direction, while speed does not. Average velocity is displacement (straight-line distance with direction) divided by time, whereas average speed is total distance traveled divided by time. For a round trip, average velocity is zero, but average speed is not.
- GeneralClass 12All
What is 240 km in 4 hours speed?
Speed = 240 km ÷ 4 hours = 60 km/h
- GeneralClass 12All
How to get average speed and velocity?
Average speed = Total distance traveled ÷ Total time Average velocity = Total displacement (change in position) ÷ Total time The key difference is that displacement considers direction and is the straight-line distance from start to finish, while distance is the total path traveled.
- GeneralClass 12All
How many formulas are there for average speed?
There are several formulas depending on the scenario: Basic: Average Speed = Total Distance ÷ Total Time Equal distances, 2 speeds: (2 × Speed₁ × Speed₂) ÷ (Speed₁ + Speed₂) Equal times, multiple speeds: Sum of speeds ÷ Number of speeds Weighted average when times differ: Total distance ÷ Total time
- GeneralClass 12All
How to find average speed when 4 speeds are given?
For four equal-distance segments, the formula becomes more complex. The practical approach is: Assume a distance for each segment (e.g., 100 km each) Calculate time for each segment (distance ÷ speed) Add all distances and all times Divide total distance by total time
- GeneralClass 12All
What is the short trick for average speed?
For equal distances at two speeds: Use the harmonic mean (2ab)/(a+b). For equal times at different speeds: Simply average the speeds arithmetically (add and divide by the number of speeds). Always identify whether the problem involves equal distances or equal times—this determines which method to use.
- GeneralClass 12All
How to calculate average speed when 3 speeds are given?
If you travel equal distances at three different speeds, use: Average Speed = (3 × Speed₁ × Speed₂ × Speed₃) ÷ (Speed₁ × Speed₂ + Speed₂ × Speed₃ + Speed₁ × Speed₃) Alternatively, if you know the time spent at each speed, calculate total distance and total time, then divide.