Machine A produces bolts at a uniform rate of 120 every 40 seconds, and machine 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 20 bolts?
A 15
B 20
C 25
D 10
Solution
Correct Answer: Option C
অ্যাপ/ওয়েবসাইটে রুটিনভিত্তিক নিয়মিত লাইভ পরীক্ষা হচ্ছে।