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Correct option is A)

Diameter of the rear wheel D =1.5 m

Distance covered in one revolution = circumference of the wheel = $πD=1.5π$m

Now, Distance covered in 80 revolution $=80×1.5π=120πm$

Let $d$ be the diameter of the front wheel.

Now, Distance covered in one revolution by front wheel $=πd$ m

Now, Distance covered in 240 revolution by front wheel $=240πd$ m

Distance covered by front wheel in 240 revolution = Distance covered by rear wheel in 80 revolution

$=>240πd=120π$

$=>d=21 $ m

$=>d=0.5$ m

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