SOLUTION: Please help me solve this problem: Train A leaves a station traveling at 80 kilometers per hour. Two hours later, train B leaves the same station traveling in the same direction

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Question 913957: Please help me solve this problem:
Train A leaves a station traveling at 80 kilometers per hour. Two hours later, train B leaves the same station traveling in the same direction at 100 kilometers per hour. How long does it take train B to catch up to train A?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Train A speed= 80 km/h , starts at
Train B speed= 100 km/h starts at

Time difference between the starting of the two= 2.00 hours

Time taken by Train A = X / 80
Time taken by Train B = X / 100

X / 80 - X / 100 = 2

LCD - 90
Multiply equation by 90 90

1.13 x - 0.9 x = 180
0.23 x = 180
/ 0.23
x= 800 km
Train B speed= 100 km/h
Distance = 800 miles
Time taken = 800 / 100
Time taken = 8 hours