1 . Machine A produces bolts at a uniform rate of 120 every 40 seconds and Machine B produces bolts at a uniform rate of 100 every 20 seconds. If the two machines run simultaneously , how many seconds will it take for them to produce a total of 200 bolts.

• A. 22
• B. 25
• C. 28
• D. 32

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Answer: Option B

Explanation: