Problema Solution
At what times of the day between 10:00a.m. and 5:00p.m do the chemistry presentation and the recycling presentation start at the same time? Giving that the chemistry is every 30 minutes and the recycling is every 40 minutes. Least common multiple...
Answer provided by our tutors
The least common multiple of 30 min and 40 min is 120 min. So, the two presentations have the same starting time every 2 hours (since 120 min = 2 hours).
If they start at the same time at 10:00 am, then they'll start at 12:00 pm, 2:00 pm and 4:00 pm.