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A boy travels with a speed of $10\ ms^{-1}$ for $30\ minute$. How much distance does he travel.
As given, speed of the boy $v=10\ ms^{-1}$
Time taken for the walk $t=30\ minute=30\times60=1800\ second$ [$\because 1\ minute=60\ second$]
Therefore, the distance travelled by the boy $s=speed\times time=v\times t$
$=10\ ms^{-1}\times 1800\ s$
$=18000\ m$
$=\frac{18000}{1000}\ km$ [$\because 1000\ m=1\ km$]
$=18\ km$
Thus, the boy travelled $18\ km$.
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