The task is to generate the correct answer for a given math problem.

[Q]: Problem: 10 ^ ( 600 ) a 10 ^ ( 580 ) = ?
[A]: 10 ^ 20

[Q]: Problem: . 005 / ? = . 01
[A]: . 5

[Q]: Problem: the speed of a railway engine is 74 km per hour when no compartment is attached , and the reduction in speed is directly proportional to the square root of the number of compartments attached . if the speed of the train carried by this engine is 24 km per hour when 9 compartments are attached , the maximum number of compartments that can be carried by the engine is :
[A]:
1