two automobiles are 60 miles apart an dtraveling in the same direction. The first automobile is behind the second and is moving at 60 mph and overtaking the second automobile which is moving at 45 mph. in how many hours will the first pass the second.
a)4 b)2.5 c)1.75 d)1.5 e).55
D=RT
Total distance of the the second car is 60miles +x
Total distance of the first car is x
Two equations:
1.) 60miles+x=60mphT
2.) x=(45mph)T
Substitute 2 into 1 gives the following:
60miles + 45mphT=60mphT
Solve for T:
60miles=15mphT
60miles/15mph=15mph/15mphT
4hr=T
Answer choice A is the best answer choice.