<PRE><B>Question 1016132</B>
A hemispherical tank full of water is emptied by a pipe at the rate of 25/7 litres per second. How much time will it take to empty half the tank, if it is 3m in diameter
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r = 1.5 meters
{{{Vol = 4pi*r^3/3}}} --&gt; {{{2pi*r^3/3}}} for 1/2 the sphere.
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&quot;1/2 the tank&quot; is {{{pi*r^3/3}}}
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Using 1.5 meters gives cubic meters.
1 cubic meter = 1000 liters
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time = liters/(liters/sec) in seconds


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