Question 871968: a car leaves town a for town b, which are 550 km apart, at an average speed of 72 km/h. at the same time, a truck leaves town b for town b and travels along the same road as the far at an average speed of 38 km/h. find the time taken for the two vehicles to meet.
i know the answer is 5 hours, but i need the way because i cannot understand.. thank you:)
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! a car leaves town a for town b, which are 550 km apart, at an average speed of 72 km/h.
at the same time, a truck leaves town b for town a and travels along the same road as the car at an average speed of 38 km/h.
find the time taken for the two vehicles to meet.
:
Let t = time it takes for them to meet
:
When the two meet, they will have traveled a total of 550km
:
Write a distance equation, dist = speed * time
then
72t = car's dist
38t - truck's dist
:
Car dist + truck dist = 550 km
72t + 38t = 550
Add like terms
110t = 550
t = 550/110
t = 5 hrs
:
Do you understand this now?
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