Question

2) Three engineers purchased their new cell phone together on the same date but each one got a different cell phone brand. The first cell phone brand gets replaced with a new one every 3 years, the second cell phone brand gets replaced with a new one every 4 years, and the third cell phone brand gets replaced with a new one every 5 years. After how many years will three engineers have new cell phones together?

Answer 1

60 years

Explanation:

Eventually, the multiples of each number will reach 60.