The wheel of a cart is making 5 revolutions per second. If the diameter W. of the wheel is \( 84...

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The wheel of a cart is making 5 revolutions per second. If the diameter
W. of the wheel is \( 84 \mathrm{~cm} \), find its speed in km per hour. [Take \( \pi=\frac{22}{7} \). ]
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