If Robert can sell 40 envelopes in 1 minute and Paul can do the same job in 80 seconds how many minutes ( to the nearest minute) it will take the two of them working together, to seal 350 envelopes?
A. 4 minutes
B. 5 minutes
C. 6 minutes
D. 7 minutes
E. 8 minutes
সঠিক উত্তরঃ
B.
5 minutes
Explanation:
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