Problema Solution
Two trains leave a train station at the same time. One travels east at 10 mph. The other train travels west at 9mph. In how many hours will the two trains be 85.5 miles apart
Answer provided by our tutors
let
v1 = 10 mph the speed of the train going east
v2 = 9 mph the speed of the train going west
d = 85.5 mi
t = ?
since distance = speed*time
v1*t + v2*t = d
10t + 9t = 85.5
by solving we find
t = 4.5 hr
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in 4.5 hours the trains will be 85.5 miles apart.