One machine takes 3 minutes to check fault in 100 km fiber optic cable.Another machine does the same job in 3 seconds.What time will it take to do the same job when both machines are put to work? Choose the most appropriate option.
A) 2.00 seconds	B) 2.20 seconds	C) 2.50 seconds	D) 2.95 seconds	E) 3.00 seconds

Rationale: by guess it is clear that the time taken will be less than 3 seconds and very near to it . therefore , answer 2.95 seconds will be correct . answer - d
Answer: D