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September 21, 2014

September 21, 2014

Posted by **John** on Monday, December 5, 2011 at 2:18pm.

- math -
**MathMate**, Monday, December 5, 2011 at 3:46pmUsing algebra:

let x=speed of slower train

then x+25 = speed of faster train

After two hours, total distance travelled:

2(x + x+25) = 162 miles

divide by two to get

2x+25 = 81

2x=81-25=56

x=28 mph (slower train, it'd better be half price!)

faster train = 28+25 = 53 mph

Check: (28+53)*2=162 :)

By mental calculations, no pen, paper nor calculator:

Reasoning:

Over two hours, the faster train travelled 50 miles more than the slower. So if both travelled at the slower speed, they would have travelled a total of 162-50=112miles in two hours. Each (of the slower) will have a speed of 112/4=28 mph. The faster one, of course, travels at 28+25=53 mph.

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