SOLUTION: A man covers distance of 120 km from town A to Town B at an average speed x km/h. If he increased his average speed by 1 km/h he would saved 30 minutes. What is his average speed?

Question 874687: A man covers distance of 120 km from town A to Town B at an average speed x km/h. If he increased his average speed by 1 km/h he would saved 30 minutes. What is his average speed?
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
CONDITION________speed________time_______distance
Did_______________x____________t_________
If_______________x+1__________t-1/2______

Both x and t can be solved. See that a substitution will be possible using the "did" equation.

The "If" equation,

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Again substitute using .

.
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Check discriminant. 4+4*480=1924.
481 is a prime number.
4(481) is discriminant.
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