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 result:

d =  20 km


 d+h=180 d/50+h/100=2  d+h=180 2d+h=200  d=20=20 km h=160

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