Problema Solution
Two trains stared at the same time from the same station and traveled in opposite directions. One traveled at a rate of 50 mph and he other at a rate of 60 mph. in how many hours were they 660 miles apart.
Answer provided by our tutors
Let
v1 = 50 mph the average speed of the first train
v2 = 60 mph the average speed of the second train
d = 660 mi the total distance between them
t = the time of the travel
Since speed = distance/time we have distance = speed*time:
The travel travel in opposite directions thus the sum of the their distances passed is equal to the distance between them:
v1t + v2t = d
50t + 60t = 660
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click here to see the equation solved for t
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t = 6 hr
After 6 hours the trains will be 660 miles apart.