SOLUTION: The difference in the average speed of two trains is 16 miles per hour. The slower
train takes 2 hours longer to travel 170 miles than the faster train takes to travel
150 mile
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Question 953335: The difference in the average speed of two trains is 16 miles per hour. The slower
train takes 2 hours longer to travel 170 miles than the faster train takes to travel
150 miles. Find the speed of the slower train
Answer by josgarithmetic(39800) (Show Source): You can put this solution on YOUR website!
____________________speed__________time___________distance
SLOW________________r______________t+2____________170
FAST________________r+16___________t______________150
Implied variables;
RT=D uniform travel rates
Two equations in two unknown variables.
;
PREPARE FOR GENERAL SOLUTION FOR QUADRATIC EQUATION
Discriminant:
;
, obviously the PLUS form is needed.
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