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?

Result

d =  20 km

#### Solution:

$\ \\ d+h=180 \ \\ d/50 + h/100=2 \ \\ \ \\ d+h=180 \ \\ 2d+h=200 \ \\ \ \\ d=20 \ \\ =20 \ \text{km} \ \\ h=160 \ \\$

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