Discussion

Explanation:

If x is the number of rotations made by the smaller wheel, and y is the number of rotations made by the larger wheel in covering a certain distance, then

(x) × (315) = y × 420       …(1)

 x = y + 10        …(2) (Given)

From (1) and (2), 

⇒ (y + 10) (315) = y × 420   …(3)

∴ y = 30 

So, distance covered by the wagon = 30 × 420 = 126 m.

Hence, option (a).

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