A factory uses robots to manufacture batteries. For each battery that is made, it takes a robot 6 minutes to gather the materials for the battery and 9 minutes to create the battery. If the factory has 10 robots working on batteries at the same time, how many batteries can the robots manufacture in 5 hours?
Thoughts? Step-by-step reasoning:
For each battery that a robot makes, it takes 9 + 6 = 15 minutes to create the battery. In 60 minutes, one robot can make 60 / 15 = 4 batteries per hour. If the factory uses 10 robots at the same time, then they can produce 10 * 4 = 40 batteries per hour. At a rate of 40 batteries per hour, 10 robots can produce 40 * 5 = 200 batteries in 5 hours.
Thus, the answer is 200.