Homework Help: math

Posted by israel on Saturday, November 12, 2011 at 10:58pm.

how do i solve this: a Train leaves Poughkeepsie to grand central station in NYC at an average speed of 40 mph. a half hour later an express train leaves poughkeepsie station to NYC at a speed of 50 mph. both trains arrive at NYC the same time. based on this info calculate the distance between poughkeepsie and NYC

math - Reiny, Sunday, November 13, 2011 at 1:03am
let the distance be x miles
time for first train = x/40
time for second train = x/50

x/40 - x/50 = 1/2
times 200
5x - 4x = 100
x = 100
Distance is 100 miles

check: to go 100 miles at 40 mph takes 100/40 hrs = 2.5
to go 100 miles at 50 mph takes 100/50 = 2hrs.
Does it take 1/2 less ? YES

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