Question

In a $300$ m race A beats B by $22.5$ m or $6$ seconds. B's time over the course is :

• A. $86$ sec
• B. $80$ sec
• C. $76$ sec
• D. None of these

Answer 1

The correct option is A $86$ sec

B runs $\frac{45}{2}$ m in 6 sec.
$\therefore$ B covers 300 m in $\left(\begin{array}{c}6\times \frac{2}{45}\times 300\end{array}\right)sec=80sec.$