Machine A is 4 times as fast as machine B. B runs an application in 30 seconds. How fast will A run it?

Machine A is 4 times as fast as machine B. B runs an application in 30 seconds. How fast will A run it?



A. 120 seconds
B. 7.5 seconds
C. 90 seconds
D. 10 seconds


Answer: B. 7.5 seconds


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