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

86 sec
80 sec
76 sec
None of these
Explanation:

B runs$ \dfrac{45}{2} $m in 6 sec.

$\therefore$ B covers 300 m in$ \left(6 \times\dfrac{2}{45} \times 300\right) $sec= 80 sec.

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