Solve the word problem.
A train is moving at a uniform speed of $75 km / h$ . How far will it travel in $20$ minutes?

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Solution

Unitary method
A train takes $60 minute (1 hr)$ to cover $75 km$ .
$\Rightarrow$ In $1 minute$ , it covers $=$ $\frac{75}{60} km$
$\Rightarrow$ In $20 minute$ , it covers $= \frac{75}{60} \times 20$ $= 25 km$
Hence, $25 km$ far will it travel in $20$ minutes.

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