Find the average speed of train travelling $144 km$ in $2 hr$ . Express the answers in $\frac{m}{s}$ .

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Solution

Step-1: Given data
Distance travelled by the train= $X = 144 km = 144 \times 1000 m = 144000 m$
Time taken = $t = 2 hr = 2 \times 3600 \sec = 7200 \sec$
Average speed=?
Step-2: Formula used
Average speed= $V_{avg} = \frac{X}{t}$
Step-3: Calculating the average speed
Average speed= $V_{avg} = \frac{X}{t} = \frac{144000 m}{7200 s} = 20 \frac{m}{s}$
The average speed of the train is $20 \frac{m}{s}$ .

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