Bob is hiking down a 12-mile country trail. He could hike at 3 mph for the first two hours and then go the rest of the way at 5 mph or he could just go the whole way at 4 mph. How long would each of these options take? Which option is the faster?

Two cyclists leave a city at the same time, one goingeast and the other going west. The westbound cyclist bikes5 mph faster than the eastbound cyclist. After 6 hours theyare 246 miles apart. How fast is each cyclist riding?

A trucker drove 175 miles to make a delivery and returned home on the same route. Because of foggy conditions, his average speed on the return trip was 10 mph less than his average speed going. If the return trip took 2 hours longer, how fast did he drive in each direction? going ? mph returning ? mph

Jamaal took his boat downstream 15 miles on the Meramec River from his campsite to a bridge where he turned around and went back upstream to his campsite. His trip upstream was 10 miles per hour slower than his trip downstream. It took him 2 hours longer to get to his campsite than it took to get to the bridge. Find Jamaal's speed downstream.