Travelling at a constant speed of $45 k m / h$ , how long will a motorcycle take to make $12$ laps around a rectangular track $800 m$ long and $400 m$ wide?

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Solution

Distance to be travelled = 12 × Perimeter
= 12 × 2(Length + Breadth)
= 12 × 2( 0.8 + 0.4 )km
= 12 × 2(1.2)km
= 28.8 km
Speed = 40km/ hr
Time taken = Distance / Speed
= 28.8/40 hr
= 0.72 hr

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