Machine A can produce 40 bolts per minute, whereas machine B can produce only 30 per minute. Machine A begans along to make bolts but it breakdown after 1.5 minute and machine B must complete the job . If the job requires 300 bolts, how long does the whole operation take?
A. 7.5 minutes
B. 8 minutes
C. 8.5 minutes
D. 9 minutes
E. 9.5 minutes
সঠিক উত্তরঃ
E.
9.5 minutes
Explanation:
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