Solve the word problem.
A train is moving at a uniform speed of $75 km / h$ . Find the time required to cover a distance of $250 km$ .

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Solution

Unitary method
A train covers $75 km$ in $1 hr$ .
$\Rightarrow$ To cover $1 km$ , it takes $=$ $\frac{1}{75} hr$
$\Rightarrow$ To cover $250 km$ , it takes $= \frac{1}{75} \times 250$ $= \frac{10}{3} hr$ or $3 hr 20 \min$
Hence,it takes $3 hr 20 \min$ to cover a distance of $250 km$ .

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Solve the word problem.A train is moving at a uniform speed of 75km/h. Find the time required to cover a distance of 250km.

Unitary methodA train covers 75km in 1hr.⇒ To cover 1km, it takes =175hr⇒To cover 250km, it takes =175×250=103hr or 3hr20minHence,it takes 3hr20min to cover a distance of 250km.

Solve the word problem.
A train is moving at a uniform speed of $75 km / h$ . Find the time required to cover a distance of $250 km$ .

Unitary method
A train covers $75 km$ in $1 hr$ .
$\Rightarrow$ To cover $1 km$ , it takes $=$ $\frac{1}{75} hr$
$\Rightarrow$ To cover $250 km$ , it takes $= \frac{1}{75} \times 250$ $= \frac{10}{3} hr$ or $3 hr 20 \min$
Hence,it takes $3 hr 20 \min$ to cover a distance of $250 km$ .