Two planes travel toward each other from cities that are about 450 km apart at rates of 240 km/hr and 210 km/hr. They started at the same time. In how many hours will they meet?

t = 1 hour

Step-by-step explanation:

Oddly the distances add. Each plane will contribute a certain distance to make the 450 km. They will meet after the same number of hours have passed.

d = r * t

r1 = 240 km/hour

t1 = t

r2 = 210 km/hour

t2 = t

240*t + 210*t = 450 collect the terms on the left.

450t = 450 divide by 450

450t/450 = 450/450

t = 1

After 1 hour they will meet.

1 hour.

Step-by-step explanation:

You have to do the total distance / total speed together.

You have to do this to ensure that you are counting how fast they are travelling together.

(450 km) / the sum of their speed (240+210)

450 / (240+210)

=450 / 450

=1

Answer: 1 Hour.