math
posted by ray .
Jake and Sara each drive 270 miles to attend a conference. Jake drives at an average
speed that is 15 mi/h slower than Sara’s average speed. It takes Jake 1.5 hours longer
than Sara to drive the 270 miles. How long does it Jake to make the trip?

since time = distance/speed, If Jake's speed is x,
270/x = 270/(x+15) + 1.5
x = 45
So, it takes Jake 270/45 = 6 hours