Question 807588
Two trains (local and express) start at the same time going from A to B
The express train travels 120km and averages 20km per hour faster than the local train. If the local train still has 80km to go when the express train arrives at B, what is the average speed of the express train? 
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Express Train DATA:
rate = 120 km/hr ; time = t hrs ; distance = 120t km
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Local Train DATA::
rate = 100 km/hr ; time = t hrs ; distance = 100t km
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Equation:
express dist - local distance = 80 km
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120t - 100t = 80
20t = 80
time = 4 hrs
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Ans: Average speed of the express train = 120 km/hr
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Cheers,
Stan H.
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