Question

2 o'clock starts turning on at the same time clock chimes every 15 minutes the other clock chimes every 25 minutes and how many minutes will they chime together

Answer 1

The two clock will chime together in 75 minutes

Explanation:

- The two clock will chime together in the multiples of 15 and 25

- Lets find the first common multiple of 15 and 25

∵ 15 = 5 × 3

∴ The prime factors of 15 are 3 and 5

∵ 25 = 5 × 5

∴ The prime factor of 25 is 5

∴ The lowest common multiple of 15 and 25 = 5 × 3 × 5 = 75

∴ The two clocks will chime together every 75 minutes