Question

multiple choice question
what is the average speed of a train that takes 1.5 h to travel 210 km?

110 km/h

320 km/h

420 km/h

140 km/h

Explanation:

Step1: Recall the formula for average speed

The formula for average speed \( v \) is \( v=\frac{d}{t} \), where \( d \) is the distance traveled and \( t \) is the time taken.

Step2: Substitute the given values

We are given that \( d = 210\space km \) and \( t=1.5\space h \). Substituting these values into the formula, we get \( v=\frac{210}{1.5} \).

Step3: Calculate the value

\( \frac{210}{1.5}=\frac{210\times10}{1.5\times10}=\frac{2100}{15} = 140\space km/h \).

Answer:

140 km/h (the option with "140 km/h")