Question 335790
 driving from town A to town D, you pass thru town B then town C.
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town A to town B is 10 miles farther than from town B to town C. 
town B to town C is 10 miles farther than from town C to town D. 
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if town A is 390 miles from town D, how many mile is town A to town B?? 

A-------B-------C-------D
.-------------------------.=390
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Let dist. from B to C be "x" miles.
Then dist. from A to B is "x+10" miles.
And dist. from C to D is "x -10" miles
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Equation:
x+10 + x + x-10 = 390
3x = 390
x = 130 miles
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A to B = x+10 = 140
B to C = x = 130
C to D = x-10 = 120
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Cheers,
Stan H.
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