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An engine can move at the speed of 20/3 m/s without any wagon attached. Reduction in the speed of the train is directly proportional to the square root of the no. of wagons attached . When there are only 4 engines attached its speed is (50/9) m/s. The greatest no. of wagons with which the engine can move is :

A

144

B

143

C

12

D

None of these

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The correct Answer is:
B
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