Question 3 - A train travels at a speed - Questions at the end of the chapter - Chapter 8 Class 7 - Measurement of Time and Motion (Curiosity)

Last updated at August 14, 2026 by

Q 3
Question
A train travels at a speed of 25 m/s and covers a distance of 360 km. How much time does it take?

🔗 Concept: 8.3.1 Speed, Distance, and Time

Train at 25 m/s, distance 360 km — find time taken. Question 3 - A train travels at - Measurement of Time an - Class 7 (Cu - Questions at the end of the chapter
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Time = 14,400 s = 4 h

Explanation

📋 Given
  • Speed = 25 m/s
  • Distance = 360 km
🔄 Unit Conversion
  • Speed is in m/s. Distance must also be in metres.
  • 360 km → multiply by 1000 → 360,000 m.
  • Why: 1 km = 1000 m.
📐 Formula

Time = Distance ÷ Speed

Step 1 — Convert distance to metres

360 km × 1000 = 360,000 m

Step 2 — Calculate time in seconds
$$\text{Time} = \frac{360{,}000 \text{ m}}{25 \text{ m/s}} = 14{,}400 \text{ s}$$
Step 3 — Convert seconds to hours

Divide by 3600 (since 1 h = 3600 s).

$$\frac{14{,}400}{3600} = \boxed{4 \text{ h}}$$
Time = 14,400 s = 4 h — convert distance to same unit as speed before using the formula.
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