Speed, Distance and Time
ICSE · Class 7 · Mathematics
Quick revision notes for Speed, Distance and Time — ICSE Class 7 Mathematics. Key concepts, formulas, and definitions for last-minute revision.
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Key Topics to Revise
1. Core Ideas and Definitions
- Speed is the distance covered by a moving object in unit time.
- Distance is the quantity covered by a moving body.
- Time is the duration taken to cover a distance.
2. Unit Conversion of Speed
- 1 km/h = 5/18 m/s.
- 1 m/s = 18/5 km/h = 3.6 km/h.
- To convert km/h into m/s, multiply by 5/18.
3. Solved Examples for Speed, Distance and Time
- A direct speed calculation uses speed = distance / time.
- A direct distance calculation uses distance = speed × time.
- A direct time calculation uses time = distance / speed.
4. Average Speed
- Average speed is found by dividing total distance by total time.
- Average speed is not the simple average of separate speeds.
- Different parts of a journey can have different distances and different times.
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