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A long horizontal belt is moving from left to right with a uniform speed 2 m/s. There are two ink marks A and B on the belt 60 m apart. An insect runs on the belt to and fro between A and B such that its speed relative to belt is constant and equals 4 m/s. When the insect is moving on the belt in the direction of motion of the belt, its speed as observed by a person standing on ground will be:

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6 m/s

2 m/s

1.5 m/s

4 m/s

answer is A.

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Detailed Solution

$v_{actual} = v_{relative} + v_{reference} \Rightarrow observed speed = 6 m / s .$

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