সব প্রশ্নে ফিরে যান
Math
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
সঠিক উত্তর