The wheels needs to travel 250m
we need to find in how many rotations, we know in one rotation
(one complete rotation = 360 deg rotation), the wheel will cover the distance = circumference.
hence, n = total distance to be traveled /distance covered in one rotation
hence we need circumference.
St1) Dia is known, hence circumference is known.
SufficientSt2) The wheel made twenty 360 degree rotations per minute. but since we don't know the distance traveled in one rotation, it is NOT sufficient.
Suppose if the wheel is very small, say of size of a coin, it has to make many revolution.
but if the wheel is very BIG, only a few revolution.
Hence , the Time factor has no role to play, We need the circumference,
NOT Sufficient.Answer A
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