Two buses leave Houston at the same time and travel in opposite directions. one bus averages 55mi\h anf the other bus averages 45 MI/ h when will they be 400 MI apart
In 4 hours if you count the miles by the road linking the 2 buses. This is because 55 for one bus and 45 for the other bus added together equals 100 miles/hour. Therefore, 4 hours will be the time the 2 buses are 400 miles apart.
