A $2 \mathrm{~m}$ long bike crosses a $22 \mathrm{~m}$ long bridge in $0.8 \mathrm{sec}$. At what speed was the bike travelling ?
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A $2 \mathrm{~m}$ long bike crosses a $22 \mathrm{~m}$ long bridge in $0.8 \mathrm{sec}$. At what speed was the bike travelling ?
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Solution

$\begin{array}{cc}\text {  Time taken } & \text { Distance } \\ (\mathrm{sec}) & \text { covered }(\mathrm{m}) \\ 0.8 & 24 \\ 1 & ?(x)\end{array}$

From the property of ratio and proportion, we get

$0 \cdot 8: 1:: 24:$ Distance covered

$\therefore$ Distance covered in 1 sec $1 \mathrm{sec}$

in 1 sec

$$

=\frac{1 \times 24}{0.8}=30 \mathrm{~m}

$$

$\therefore$ The speed of the bike

$=30 \mathrm{~m} / \mathrm{s}$; Ans.

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