Question 135669: a truck traveling at a constant rate of 45mph .one hour later a car traveling at a rate 60mph same direction on highway.howlong will it take for the car to catch up to the truck, if both vehicles continue in same direction?
Answer by ptaylor(2198)   (Show Source):
You can put this solution on YOUR website! Distance(d) equals Rate(r) times Time(t) or d=rt; r=d/t and t=d/r
Let t=the time it takes the car to catch the truck after the car starts the trip.
Now we know that when the car starts travelling, the truck has already travelled 45*1 or 45 mi
distance truck travels=45+45t
distance car travels =60t
When these distances are equal, then the car will have caught the truck, so:
45+45t=60t subtract 45t from each side
45+45t-45t=60t-45t collect like terms
45=15t divide both sides by 15
t=3 hrs-------------time it takes the car to catch the truck after the car begins the trip.
CK
45+45*3=60*3
45+135=180
180=180
Hope this helps---ptaylor
Distance car tra
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