Dirty road

Mr. Smith is on a road trip to a remote disc golf course 180km away. He travels part of the way at 100km/h along the highway and part of the way at 50km/h along dirt roads. If it took 2 hours to get there, how many hours did he spend on dirt roads?

Correct answer:

d =  20 km

Step-by-step explanation:

d+h=180 d/50+h/100=2  d+h=180 2d+h=200  Pivot:Row1Row2 2d+h=200 d+h=180  Row221 Row1Row2 2d+h=200 0.5h=80  h=0.580=160 d=2200h=2200160=20=20 km  d=20 h=160



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