The safe speed for a train rounding a corner is proportional to the square root of the radius . If the safe speed for a curve of radius 49 meters is 28 km/h. The safe speed for a curve of radius 64 metes is :

The safe speed for a train rounding a corner is proportional to the square root of the radius . If the safe speed for a curve of radius 49 meters is 28 km/h. The safe speed for a curve of radius 64 metes is :
  • A) (256/7) km /h
  • B) (256/7)km /h
  • C) 23 km /h
  • D) 32 km /h

Correct Answer: A) (256/7) km /h

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