Question

Sam is driving from Chicago to San Francisco, a distance of 2220 miles. He covers the first 192 miles in 4 hrs. At this rate, how long will the entire trip take?

Answer 1

We can set it up like this:


`(192)/(4) = (2220)/(x)`

This states that Sam can drive 192 miles in 4 hours and 2220 miles in x hours. To solve, we can use cross-multiplication:


`192x = 2220*4 \\ 192x = 8880 \\ x = (8880)/(192) \\ x = 46.25`

It will take Sam 46.25 hours to drive the whole trip, or 46 hours and 15 minutes.