If the wheel of the engine of a train $$4\frac{2}{7}$$ metres in circumference m

Question

If the wheel of the engine of a train $$4\frac{2}{7}$$ metres in circumference makes 7 revolutions in 4 seconds, then the speed (in km/hr) of the train is :

Options:

A . 27

B . 28

C . 29

D . 30

Answer: Option A

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