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A train engine can run at 56 kmph withou...

A train engine can run at 56 kmph without any wagon. Decrease in speed of engine is directly proportional to square root of number of wagons attached. Speed becomes 40 kmph on attaching 4 wagons. Find maximum no, of wagons which engine can carry,

A

A)9

B

B)13

C

C)48

D

D)49

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D
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