Question

How long will a boy take to run around a square of side 35 metres, if he runs at the rate of 7.2 km/h

Answer 1

$\huge{\bf{\mathfrak{Heya!!}}}$
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$total \: distance \: that \: the \: boy \: will \\ \: take \: round \: = 4 \times 35 = 140 \\ \\ speed \: of \: the \: boy = 7.2 \frac{km}{h} \\ \\ as \: we \: know \: that \\ \\ (speed = \frac{distance}{time} ) \\ \\ 7.5 \frac{km}{h} = \frac{140km}{time}\\ time =. Distance / speed\\ time = 140 km/7.5km/hr\\ \\so, time =18.6 hrs \\ \\ \\ \\ so \: the \: boy \: will \: take \: 18.6 \: hours$
Thanks. ;-)