Two planes leave an airport the same time and travel in opposite directions. one plane averages 300 miles per hour, and the other plane averages 600 miles per hour. when will they be 2700 miles apart?

In 3 hours, the two planes will be 2,700 miles apart.

If in one hour, the planes get 900 miles apart, it will take 3 hours to become 2,700 miles apart.

《 and 》 Indicatethe planes moving in opposite directions.

The number indicate the distance traveled.

The amount of times the number is repeated indicates the amount of hours flown (ex.: 50+50+50+50 would indicate 4 hours flown because there are 4 50s in the sequence).

So
《300 + 600》
=900 miles in one hour

《300+300 and 600+600》
=1,800 miles in 2 hours

《300+300+300 and 600+600+600》
=2,700 miles in 3 hours