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Question

Usha walked a distance of $3.6$ km in $15$ minutes. What was her speed in km per hour?

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Solution

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Distance walked by Usha $= 3.6 k m$

Time taken $= 15 m i n u t e s = \frac{1}{4} h o u r$

speed of Usha = $\frac{d i s t a n c e}{t i m e} = \frac{3.6}{\frac{1}{4}} = 14.4 k m / h r$

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