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?
2 answers:
Answer:
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.
Answer:
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.
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