Problema Solution
Train averaging 180 miles per hour leaves San Francisco at 2 p.m. for Los Angeles 600 miles away. At the same time a second train leaves Los Angeles to San Francisco on the same track traveling 120 miles per hour. How long does it take for collision to occur?
Answer provided by our tutors
let
t = the time of trains travel until the collision
since distance = speed*time
180*t + 120*t = 600
by solving we find
t = 2 hr
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the trains will collide in 2 hours.