Two heavily loaded sixteen-wheeler transport trucks are 940 kilometers apart, sitting at two rest ...

Two heavily loaded sixteen-wheeler transport trucks are 940 kilometers apart, sitting at two rest stops on opposite sides of the same highway. Driver A begins heading down the highway driving at an average speed of 90 kilometers per hour. Exactly one hour later, Driver B starts down the highway toward Driver A, maintaining an average speed of 80 kilometers per hour. How many kilometers farther than Driver B, will Driver A have driven when they meet and pass each other on the highway?

Quiz

Answer/Solution

140

Steps/Work

I've been reading the website for a while and I'm always keen to see different approaches so I would like to share one that works for me:
Short version:
Truck A travels for an hour.
Distance remaining = 940-90 = 850k
Ratio of speeds 9:8 -> 850/17 = 50
Truck A = 90 + 50*9 = 540
Truck B = 50*8 = 400
Delta = 140km
Answer D

General Calculator / Auto Solver

Two heavily loaded sixteen - wheeler transport trucks are kilometers apart, sitting at two rest stops on opposite sides of the same highway. Driver a begins heading down the highway driving at an average speed of kilometers per hour. Exactly one hour later, driver b starts down the highway toward driver a, maintaining an average speed of kilometers per hour. How many kilometers farther than driver b, will driver a have driven when they meet and pass each other on the highway?

Calculated Answer

140

Step by Step Solution

In order to solve problem, you must evaluate n1 + (n0 - n1) / (n1 + n2) * (n1 - n2).

n0 =940
n1 =90
n2 =80