Jamal needs 8 hours to do a job. Kamal takes 10 hours to do the same job. How long should it take Kamal & Jamal working together to do the job?
A. 5 hours
B. 4 1/2 hours
C. 2 1/2 hours
D. 4 4/9 hours
E. None of these
সঠিক উত্তরঃ
D.
4 4/9 hours
Explanation:
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