Aflorist is making blue and white flower arrangements. for the arrangements, he places a red ribbon on every 3rd arrangement and a blue ribbon on every 5th arrangement. which arrangement will be the first to have a red ribbon and a blue ribbon?

Starting at home, emily traveled uphill to the hardware store for 606060 minutes at just 666 mph. she then traveled back home along the same path downhill at a speed of 121212 mph. what is her average speed for the entire trip from home to the hardware store and back?