Question

At a particular time, the length of the shadow of Qutub Minar whose height is 72 m is 80 m. What will be the height of an electric pole, the length of whose shadow at the same time is 1000 cm?

• A. 7.2 m
• B. 9.0 m
• C. 9.6 m
• D. 10.2 m

Answer 1

The correct option is B 9.0 m

As the length of object increases, the length of shadow of the object will also increase. So, this is a case of direct proportion.

1 m = 100 cm
$So,1000cm=\frac{1000}{100}=10m$

$\begin{array}{ccc}Lengthofobject\left(m\right)& 72& x\\ Lengthofshadow\left(m\right)& 80& 10\end{array}$

$Then,\frac{72}{80}=\frac{x}{10}x=\frac{72\times 10}{80}x=9m$