SOLUTION: A man walks for 12 km at x km/h and then jogs for another 12 km at (x + 2) km/h. He travels for a total of 5 hours. Find the value of x.
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Question 604533: A man walks for 12 km at x km/h and then jogs for another 12 km at (x + 2) km/h. He travels for a total of 5 hours. Find the value of x.
Answer by alicealc(293) (Show Source): You can put this solution on YOUR website!
speed = distance/time
so, time = distance/speed
0 = (5x + 6)*(x - 4)
5x + 6 = 0 or x - 4 = 0
5x = -6 or x = 4
5x = -6/5 or x = 4
because the speed can't be a negative number, we choose x = 4
so, x = 4
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