SOLUTION: betty went at a speed of 90 km/h for 1.9 h, stopped for lunch for 1 h, and then traveled at 125 km/h for 7.8 h. What was her average speed?

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: betty went at a speed of 90 km/h for 1.9 h, stopped for lunch for 1 h, and then traveled at 125 km/h for 7.8 h. What was her average speed?      Log On

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Question 907120: betty went at a speed of 90 km/h for 1.9 h, stopped for lunch for 1 h, and then traveled at 125 km/h for 7.8 h. What was her average speed?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
1.9+1+7.8=10.7
90+125=215
r*t=d
r=d/t
215/10.7=20.09 kph