Question 3 - Time Taken by a Train - Questions at the end of the chapter - Chapter 8 Class 7 - Measurement of Time and Motion (Curiosity)

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

Answer.

Convert the distance to metres:

$$\begin{aligned} 360 \text{ km} &= 360 \times 1000 \text{ m} \\[8pt] &= 360{,}000 \text{ m} \end{aligned}$$

Use the formula: Time = Distance ÷ Speed

$$\begin{aligned} \text{Time} &= \frac{\text{Distance}}{\text{Speed}} \\[8pt] &= \frac{360{,}000 \text{ m}}{25 \text{ m/s}} \\[8pt] &= 14{,}400 \text{ s} \end{aligned}$$

Convert to hours:

$$\begin{aligned} 14{,}400 \text{ s} &= \frac{14{,}400}{3600} \text{ h} \\[8pt] &= 4 \text{ h} \end{aligned}$$

The train takes 4 hours .