SOLUTION: Rachel has a 15km head start on Charlene. How long will it take Charlene to catch up with rachel if rachel travels at 70km per hour and charlene travels at 100 km per hour.

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Rachel has a 15km head start on Charlene. How long will it take Charlene to catch up with rachel if rachel travels at 70km per hour and charlene travels at 100 km per hour.       Log On


   

Question 1169141: Rachel has a 15km head start on Charlene. How long will it take Charlene to catch up with rachel if rachel travels at 70km per hour and charlene travels at 100 km per hour.
Answer by greenestamps(13195) About Me  (Show Source):
You can put this solution on YOUR website!


The rate at which Charlene catches up to Rachel is the difference between their two speeds, which is 100-70=30 km/h.

So the amount of time it take Charlene to make up 15km is 15/30 = 1/2 hour.