Problema Solution
A train leaves Little Rock, Arkansas, and travels north at 65 kilometers per hour. Another train leaves at the same time and travels south at 90 kilometers per hour. How long will it take before they are 310 kilometers apart?
Answer provided by our tutors
let
x = 65 km/h the speed of the train traveling north
y = 90 km/h the speed of the train traveling south
t = the time of the travel
d = 310 km the distance between the trains after t hours
after t hours the distance between the trains will be sum of the distances of each train
t*65 + t*90 = 310
155*t = 310
t = 310/155
t = 2 hours
After 2 hours the trains will be 310 km apart.