The speed of an engine is proportional to the square root of the number of wagons attached to it. Without any wagons attached to it the speed of the engine is 60km/hr. With 16 wagons attached to it the speed of the engine is 40km/hr; find the maximum number of wagons that can be attached so that the train moves

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Andy

Andy

What is the correct solution?

Andy

Andy

What is the correct solution?

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