SOLUTION: 1. A motorboat went 70 miles in 4 hours when traveling at full speed upstream on a river whose current flows at the rate of 6 miles per hour. How fast can the boat travel in still

Algebra ->  Expressions -> SOLUTION: 1. A motorboat went 70 miles in 4 hours when traveling at full speed upstream on a river whose current flows at the rate of 6 miles per hour. How fast can the boat travel in still       Log On


   



Question 930571: 1. A motorboat went 70 miles in 4 hours when traveling at full speed upstream on a river whose current flows at the rate of 6 miles per hour. How fast can the boat travel in still water?
2.A messenger traveling 65 miles per hour pursues a truck which has a start of 2 hours and overtacks it in 3 hours. Find the trucks’ speed?

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
r - 6mph = 17.6 mph +70mi%2F%284hr%29
r = 23.6mph
...........
65•3hr = r(5hr)
65•3/5 = r = 39mph