One cutting machine cuts 100 metal bars in 30 minutes.Another machine does the same job in 30 seconds.What time will it take if both machines are put on the same work ?	Choose the correct choice from the following answers.
A) 25.0 seconds
B) 29.5 seconds
C) 30.0 seconds
D) 30.5 seconds
E) 30.7 seconds

Rationale: by guess it is clear that the time taken will be less than 30 seconds and very near to it . therefore , answer 29.5 seconds will be correct . answer - b
Answer: B