Mensuration Practice Test 1

Volume of a water risen= l × b × h
= 4 × 7 × 4.5
= 126 ${\mathit{m}}^3$
Volume of the water risen
= $\left(\frac{5}{100}\times \frac{4}{100}\times \mathrm{Rate}\right)$ × [(4 × 60 × 60) + (30 × 60)]
126 = $\left(5100\times \frac{4}{100}\times \mathrm{Rate}\right)$ × (14400 + 1800)
Rate = $126\times \frac{100}{5}\times \frac{100}{4}\times \frac{1}{16200}$
Rate = $35/$ m/s
Rate = $\frac{35}{9}\times \frac{18}{5}$ = 7 × 2 = 14 km/hour.