We know,
\(1\) hour = \(60\) minutes
\(40\) minutes of an hour can be expressed as \(\frac{40}{60}\)
This fraction can be reduced further simplified
\(\Rightarrow\frac{(40 ÷ 20)}{ (60 ÷ 20) }= \frac23\)
and the simplified form gives us \(\frac{2}3\)
Therefore, \(40\) minutes is \(\frac23^{rd}\) of an hour.
Complete the drawing shown in Fig. 9.14 to indicate where the free ends of the two wires should be joined to make the bulb glow