Two workers A and B manufactured a batch of identical parts. A worked for 2 hours and B worked for 5 hours and they did half the job. Then they worked together for another 3 hours and they had to do (1/20)th of the job. How much time does B take to complete the job, if he worked alone?
- A) 24 hours
- B) 12 hours
- C) 15 hours
- D) 30 hours
HI can anyone please explain how to solve this. Answer is given as option C